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##### STATS quiz

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Question;1.;Which;of the following is a matched pairs design?;A) Measure levels;of depression for a random sample of internet users and for a random sample of;non-users. B) Measure level;of depression for a random sample on non-internet users: provide them with;internet use for a year and then measure their level of depression.;2.;Which;of the the following techniques is best used for QUANTITATIVE data?;A) Histogram B) Pie Chart C) Two-way Table D) Bar Chart;3.;Suppose;the distirbution of speeds at an interstate highway location is bell-shaped;with a mean of 73mph and a standard deviation of 4mph. About 95% of vehicles at;this location travel between ____ and ____ mph?;A) 65 and 81 mph B) 69 and 77 mph C) 61 and 85 mph;4.;Which;one of the following variables is discrete?;A) The number of;automobiles produced by Ford B) The daily high;temperature in Chicago C) The age of the;students in our class D) The weight of;the students in our class E) The;manufacturer of an automobile;5.;From the histogram above, which of the following would we expect to be true?;A) The median would;be less than the mean B) The median;would be greater than the mean C) The median;would be equal with the mean;6.;Find;the mean for the following set of values: 12, 14, 19, 13, 17.;A) 14.5 B) 14 C) 18.75 D) 15;7.;A;study found that students who procrastinate are more likely to get colds. A;sample of 300 college students was asked how often they procrastinate and if;they've had a cold in the last two months. Below is a two-way table of counts;(rows = whether or not procrastinates).;State the appropriate null hypotheses for this study.;A) There is no;relationship in the population between Procrastination and Having a;Cold. B) There is no;relationship in the sample between Procrastination and Having a Cold. C) There is;relationship in the population between Procrastination and Having a;Cold. D) There is;relationship in the sample between Procrastination and Having a Cold.;8.;A research;project was conducted to study whether gender plays a role in the acceptance of;a student into vocational education programs. A random sample of 200 applicants;for vocational education was selected from a school district. The data were;then summarized into table shown below.;The appropriate alternative hypotheses for this study is that gender and;acceptance are associated.;A) TrueB) False;9.;A;research project was conducted to study whether gender plays a role in the;acceptance of a student into vocational education programs. A random sample of;200 applicants for vocaional education was selected from a school district. The;data were then summarized into table shown below.;What are the odds of acceptance for females?;A) 45/35 B) 45/80 C) 35/80 D) 45/200;10.;Using the above regression output, what is the correct regression equation?;A) y-hat = - 21.04;+ 0.5666X1;B) y-hat = 0.5666;? 21.04X1;C) y-hat = 16.00 +;0.1475X1;D) y-hat = 16.00 +;0.5666X1;11.;Using the above regression output, then the correlation between X1 and Y would;be calculated by taking;A) The positive;square root of 0.45 B) 0.45 times 0.45;C) The negative;square root of 0.45;12;Using the above regression output, how much of the variation in Y is explained;by X1?;A) 45% B) 42% C) The positive;square root of 0.45 D) 3.98537%;13.;Based on the output above, what are the null and alternative hypotheses?;A) Ho: p =;0.2 Ha: p? 0.2 B) Ho;p?hat = 0.2 Ha: p?hat? 0.2 C) Ho: p =;0.2 Ha: p < 0.2 D) Ho;p?hat = 0.2 Ha: p?hat < 0.2 E) Ho:? =;0.2 Ha:? < 0.2 F) Ho:? =;0.2 Ha:?? 0.2;14.;Based on the output above, what is the value of the test statistic?;A) 0.2 B) 0.142 C) -0.85 D) 0.398;15.;Based on the above output what is the standard error of the mean?;A) 0.10 B) 0.50 C) 12.5 D) About 0.6;16.;Based on the output above, what would be the degrees of freedom used to find;the p-value?;A) 25 B) 24 C) 3.5 D) 3.15;17.;From a;class survey, 90% confidence intervals were created for both the females and;males who responded Yes to having smoked marijuana. The 90% confidence;intervals were 0.417 to 0.565 for the females and 0.437 to 0.609 for the males.;What conclusions can we draw in regards to the population proportions of;females and males who said that they have tried marijuana?;A) We cannot;conclude there is a difference between the population proportions. B) We cannot;conclude there is a difference between the sample proportions. C) Males are more;likely than females to have tried marijuana. D) Males are less;likely than females to have tried marijuana.;18.;Which;of the following quantities does NOT affect sample size for estimating a;population mean?;A) the confidence;level B) the sample;standard deviation C) the margin of;error D) the sample mean;19.;If you;were conducting a two sample T?test to compare two means, which of the;following would allow you to properly use the pooled method in order to perform;the test?;A) If the larger;sample standard deviation was 5 and the smaller sample standard deviation was 4;B) If the larger;sample mean was 5 and the smaller sample mean was 4 C) If the larger;standard error was 5 and the smaller standard error was 4;20.;Two TV;commercials are developed for marketing a new product. 180 people have been;randomly selected and split into two groups of 90 each. In a controlled;setting, Group A watches commercial A and Group B watches commercial B. In;Group A, 25 say they would buy the product. In Group B, 30 say they would buy;the product.;To test which commercial has better effect, two proportion z test could be;applied here since all assumptions have been satisfied.;A) TrueB) False;21.;Identify;whether the comparison is based on two independent samples or paired data;We test if the average number of hours studied by all college freshman living;in a particular dorm for their math course differs from number of hours studied;in their chemistry course during a particular semester for each student in the;study.;A) Paired B) Independent;22.;Based on the above ANOVA output, how many means are being tested?;A) 4 B) 3 C) 301 D) 304;23.;Based on the above ANOVA output, what conclusion should be made regarding the;means?;A) With p-value of;0.000 conclude that not all of the means are equal. B) With p-value of;0.000 conclude that all of the means are different C) With p-value of;0.000 conclude that all of the means are equal;24.;Based;on the number and types of variables present, select the most appropriate;display for each of the following;Number of Hours spent watching TV per day for a representative sample of;Americans.;A) Bar Graph B) Histogram C) Two-way table D) Scatterplot E) Side-by-Side;Boxplots;25.;Based;on the number and types of variables present, select the most appropriate;display for each of the following;Actual Height (in inches) and Ideal Height (in inches) for a representative;sample of PSU students.;A) Bar Graph B) Histogram C) Two-way table D) Scatterplot E) Side-by-Side;Boxplots26.;Select;the most appropriate statistical test for each of the following;We examine a random sample of State College apartments to see on average how;much rent increases per unit increase of square footage;A) 1 Proportion Test B) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D) Two-sample t-test with a one-sided;alternative E) Two-sample t-test with a two-sided;alternative F) Chi-square test G) One-Way ANOVA test H);Regression;27.;Select;the most appropriate statistical test for each of the following;We take random samples of African-American, White, Asian, and Hispanic workers;to determine if mean earnings differ among these groups;A) 1 Proportion Test B) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D) Two-sample t-test with a one-sided;alternative E) Two-sample t-test with a two-sided;alternative F) Chi-square test G) One-Way;ANOVA testH) Regression;28.;Select;the most appropriate statistical test for each of the following;We want to test for a relationship between race and employment status (employed;or unemployed);A) 1 Proportion Test B) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D) Two-sample t-test with a one-sided;alternative E) Two-sample t-test with a two-sided;alternative F);Chi-square testG) One-Way ANOVA test H) Regression;29.;Select;the most appropriate statistical test for each of the following;We want to test if men have a higher salary than women in the field of;engineering using a random sample of male engineers and a random sample of;female engineers.;A) 1 Proportion Test B) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D);Two-sample t-test with a one-sided alternative.E) Two-sample t-test with a two-sided;alternative. F) Chi-square test G) One-Way ANOVA test H) Regression;30.;Select;the most appropriate statistical test for each of the following;We want to test if more than 50% of children get a cold each Winter.;A) 1;Proportion TestB) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D) Two-sample t-test with a one-sided;alternative E) Two-sample t-test with a two-sided;alternative F) Chi-square test G) One-Way ANOVA test H) Regression;31.;Select;the most appropriate statistical test for each of the following;A researcher wants to see if female Caucasians are more likely to have blue;eyes than male Caucasians. What hypothesis test should be used?;A) One population proportion B);Difference between two population proportionsC) One population mean D) Population mean difference (paired data) E) Difference between two population means;(independent data);32.;Select;the most appropriate statistical test for each of the following;We survey a random sample of households in Philadelphia to test if less than;50% of families are families where both parents are working full time.;A) T-test about a mean with a one-sided;alternative B) T-test about a mean with a two-sided;alternative C) Chi-square test of independence D) Z-test;about a proportion with a one-sided alternativeE) Z-test about a proportion with a two-sided;alternative F) One-way Analysis of Variance (ANOVA) G) Regression;33.;Select;the most appropriate statistical test for each of the following;We test if the mean rent of all downtown Pittsburgh one bedroom apartments is;different from the mean rent of all non-downtown one bedroom apartments by;examining a random sample of downtown one-bedroom apartments and a random;sample of non-downtown one-bedroom apartments.;A) 1 Proportion Test B) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D) Two-sample t-test with a one-sided;alternative E);Two-sample t-test with a two-sided alternativeF) Chi-square test G) One-Way ANOVA test H) Regression;34.;Select;the proper NULL hypothesis;Fifty students have their blood pressures before and after an exam. We wish to;know if there is an increase, on average.;A) H0:pd = 0 B) H0:p-hat1 - p-hat2;= 0 C) H0:?d;= 0D) H0:x-bar1 - x-bar2;= 0;35.;Select;the proper NULL hypothesis;A class survey is used to compare the GPAs of male and female students.;A) H0:p1 - p2;= 0 B) H0:p-hat1 - p-hat2;= 0 C) H0:?1;-?2 = 0D) H0:x-bar1 - x-bar2;= 0;36.;Select;the proper NULL hypothesis;A study was conducted to see if there is a difference between blood pressures;of husbands and their wives.;A) H0:pd =;0B) H0:p-hat1 - p-hat2 = 0 C) H0:?d = 0 D) H0:x-bar1 - x-bar2 = 0;37.;Identify;whether the comparison is based on two independent samples or paired data;In a nationwide survey, people are asked if they think crime is a problem in;their town or not. The proportion saying yes is compared for people from large;cities versus people in small towns and rural areas.;A);IndependentB) Paired;38.;Identify;whether the comparison is based on two independent samples or paired data;Fifty students have their blood pressures before and after an exam. We wish to;know if there is an increase, on average.;A) Independent B) Paired;39.;A;statistics class has 4 teaching assistants (TAs): three female assistants;(Lauren, Rona, and Leila) and one male assistant (Josh). Each TA teaches one;discussion section. A student picks a discussion section. The two events W =;{the TA is a woman} and J = {the TA is Josh} are;A) independent events. B) mutually;exclusive events.C) each simple events. D) None of the above.;40.;Three;people are selected randomly one at a time from a group of 10 people as;representatives of the group. The group consists of 3 female and 7 male. What;is the probability for the three people selected to consist of (by order of;selection): Female, Female, Male.;A) 0.809524 B) 0.97619 C) 0.015873 D) 0.0583;41.;Which;one of the following statements is true?;A);Increasing the sample size of a survey decreases the margin of error.B) Increasing the sample size of a survey;increases the margin of error. C) Increasing the sample size of a survey;decreases the impact of response bias. D) Increasing the sample size of a survey;increases the impact of response bias.;42.;In;order to test if a coin is a fair coin, the coin is tossed 100 times and the;results (Head or Tail) were recorded for analysis. What is the sample in this;study?;A) the coin B) the;outcomes of the 100 tossesC) probability of the coin to show Head D) percentage of Heads in the 100 outcomes;43.;Which;of the following is NOT part of the 5-number summary?;A) MeanB) Median C) Maximum D) Minimum E) All of choices are part of the 5-number;summary.;44.;Exams;scores (in percentages) range from 0 to 100. Suppose an exam for STAT 200 was;easy and most of the students scored very well with only a few students scoring;low. Which would best describe the shape of the distribution?;A) Right skewed B) Left;skewedC) Bell-shaped D) Not enough information to tell;45.;A;student does not study for a 10 question multiple choice quiz, with five answer;choices for each question, so he randomly guesses an answer for every question.;Which choice below describes how to find the probability that this student gets;exactly 7 questions correct?;A) Find cumulative probability for 7 successes;for a binomial variable with n = 10 and p = 7/10. B) Find cumulative probability for 7 successes;for a binomial variable with n = 10 and p = 1/5. C) Find;probability of 7 successes for a binomial variable with n = 10 and p = 1/5D) Find probability of 7 successes for a;binomial variable with n = 10 and p = 7/10;46.;Correctly;identify whether the following situations satisfy the conditions required to;conduct a Binomial experiment. Rolling a die many times and observing whether;the number obtained is even or odd;A) BinomialB) NOT Binomial;47.;Suppose;that for X = net amount won or lost in a lottery game, the expected value is;E(X) = -$0.50. What is the correct interpretation of this value?;A) The most likely outcome of a single play is;a net loss of 50 cents. B) A player will have a net loss of 50 cents;every single time he or she plays this lottery game. C) Over a;large number of plays the average outcome for plays is a net loss of 50 cents.D) A mistake must have been made because it?s;impossible for an expected value to be negative;48.;Suppose;that X=number of heads out of 12 independent flips of a fair coin. What is the;expected value of x?;A) 6B) 12 C) 5 D) 3;49.;The;purpose of having a control group in a study is;A) to;estimate the response when the treatment is not applied.B) to decrease the margin of error. C) to be able to blind the subjects. D) to make the samples more representative.;50.;Randomly;chosen 988 American adults participated in a poll regarding whether to approve;a new gun control legislation. What is the parmaeter of interest in this study?;A) the;proportion of American adults who approve the new gun control legislationB) the proportion of the 988 people who;approve the the new gun control legislation C) Is the new gun control legislation;beneficial to society D) the number of people in poll who were;against the new gun control legislation;26.;Select;the most appropriate statistical test for each of the following;We examine a random sample of State College apartments to see on average how;much rent increases per unit increase of square footage;A) 1 Proportion Test B) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D) Two-sample t-test with a one-sided;alternative E) Two-sample t-test with a two-sided;alternative F) Chi-square test G) One-Way ANOVA test H);Regression;27.;Select;the most appropriate statistical test for each of the following;We take random samples of African-American, White, Asian, and Hispanic workers;to determine if mean earnings differ among these groups;A) 1 Proportion Test B) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D) Two-sample t-test with a one-sided;alternative E) Two-sample t-test with a two-sided;alternative F) Chi-square test G) One-Way;ANOVA testH) Regression;28.;Select;the most appropriate statistical test for each of the following;We want to test for a relationship between race and employment status (employed;or unemployed);A) 1 Proportion Test B) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D) Two-sample t-test with a one-sided;alternative E) Two-sample t-test with a two-sided;alternative F);Chi-square testG) One-Way ANOVA test H) Regression;29.;Select;the most appropriate statistical test for each of the following;We want to test if men have a higher salary than women in the field of;engineering using a random sample of male engineers and a random sample of;female engineers.;A) 1 Proportion Test B) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D);Two-sample t-test with a one-sided alternative.E) Two-sample t-test with a two-sided;alternative. F) Chi-square test G) One-Way ANOVA test H) Regression;30.;Select;the most appropriate statistical test for each of the following;We want to test if more than 50% of children get a cold each Winter.;A) 1;Proportion TestB) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D) Two-sample t-test with a one-sided;alternative E) Two-sample t-test with a two-sided;alternative F) Chi-square test G) One-Way ANOVA test H) Regression;31.;Select;the most appropriate statistical test for each of the following;A researcher wants to see if female Caucasians are more likely to have blue;eyes than male Caucasians. What hypothesis test should be used?;A) One population proportion B);Difference between two population proportionsC) One population mean D) Population mean difference (paired data) E) Difference between two population means;(independent data);32.;Select;the most appropriate statistical test for each of the following;We survey a random sample of households in Philadelphia to test if less than;50% of families are families where both parents are working full time.;A) T-test about a mean with a one-sided;alternative B) T-test about a mean with a two-sided;alternative C) Chi-square test of independence D) Z-test;about a proportion with a one-sided alternativeE) Z-test about a proportion with a two-sided;alternative F) One-way Analysis of Variance (ANOVA) G) Regression;33.;Select;the most appropriate statistical test for each of the following;We test if the mean rent of all downtown Pittsburgh one bedroom apartments is;different from the mean rent of all non-downtown one bedroom apartments by;examining a random sample of downtown one-bedroom apartments and a random;sample of non-downtown one-bedroom apartments.;A) 1 Proportion Test B) 1 mean test with a one-sided alternative C) 1 mean test with a two-sided alternative D) Two-sample t-test with a one-sided;alternative E);Two-sample t-test with a two-sided alternativeF) Chi-square test G) One-Way ANOVA test H) Regression;34.;Select;the proper NULL hypothesis;Fifty students have their blood pressures before and after an exam. We wish to;know if there is an increase, on average.;A) H0:pd = 0 B) H0:p-hat1 - p-hat2;= 0 C) H0:?d;= 0D) H0:x-bar1 - x-bar2;= 0;35.;Select;the proper NULL hypothesis;A class survey is used to compare the GPAs of male and female students.;A) H0:p1 - p2;= 0 B) H0:p-hat1 - p-hat2;= 0 C) H0:?1;-?2 = 0D) H0:x-bar1 - x-bar2;= 0;36.;Select;the proper NULL hypothesis;A study was conducted to see if there is a difference between blood pressures;of husbands and their wives.;A) H0:pd =;0B) H0:p-hat1 - p-hat2 = 0 C) H0:?d = 0 D) H0:x-bar1 - x-bar2 = 0;37.;Identify;whether the comparison is based on two independent samples or paired data;In a nationwide survey, people are asked if they think crime is a problem in;their town or not. The proportion saying yes is compared for people from large;cities versus people in small towns and rural areas.;A);IndependentB) Paired;38.;Identify;whether the comparison is based on two independent samples or paired data;Fifty students have their blood pressures before and after an exam. We wish to;know if there is an increase, on average.;A) Independent B) Paired;39.;A;statistics class has 4 teaching assistants (TAs): three female assistants;(Lauren, Rona, and Leila) and one male assistant (Josh). Each TA teaches one;discussion section. A student picks a discussion section. The two events W =;{the TA is a woman} and J = {the TA is Josh} are;A) independent events. B) mutually;exclusive events.C) each simple events. D) None of the above.;40.;Three;people are selected randomly one at a time from a group of 10 people as;representatives of the group. The group consists of 3 female and 7 male. What;is the probability for the three people selected to consist of (by order of;selection): Female, Female, Male.;A) 0.809524 B) 0.97619 C) 0.015873 D) 0.0583;41.;Which;one of the following statements is true?;A);Increasing the sample size of a survey decreases the margin of error.B) Increasing the sample size of a survey;increases the margin of error. C) Increasing the sample size of a survey;decreases the impact of response bias. D) Increasing the sample size of a survey;increases the impact of response bias.;42.;In;order to test if a coin is a fair coin, the coin is tossed 100 times and the;results (Head or Tail) were recorded for analysis. What is the sample in this;study?;A) the coin B) the;outcomes of the 100 tossesC) probability of the coin to show Head D) percentage of Heads in the 100 outcomes;43.;Which;of the following is NOT part of the 5-number summary?;A) MeanB) Median C) Maximum D) Minimum E) All of choices are part of the 5-number;summary.;44.;Exams;scores (in percentages) range from 0 to 100. Suppose an exam for STAT 200 was;easy and most of the students scored very well with only a few students scoring;low. Which would best describe the shape of the distribution?;A) Right skewed B) Left;skewedC) Bell-shaped D) Not enough information to tell;45.;A;student does not study for a 10 question multiple choice quiz, with five answer;choices for each question, so he randomly guesses an answer for every question.;Which choice below describes how to find the probability that this student gets;exactly 7 questions correct?;A) Find cumulative probability for 7 successes;for a binomial variable with n = 10 and p = 7/10. B) Find cumulative probability for 7 successes;for a binomial variable with n = 10 and p = 1/5. C) Find;probability of 7 successes for a binomial variable with n = 10 and p = 1/5D) Find probability of 7 successes for a;binomial variable with n = 10 and p = 7/10;46.;Correctly;identify whether the following situations satisfy the conditions required to;conduct a Binomial experiment. Rolling a die many times and observing whether;the number obtained is even or odd;A) BinomialB) NOT Binomial;47.;Suppose;that for X = net amount won or lost in a lottery game, the expected value is;E(X) = -$0.50. What is the correct interpretation of this value?;A) The most likely outcome of a single play is;a net loss of 50 cents. B) A player will have a net loss of 50 cents;every single time he or she plays this lottery game. C) Over a;large number of plays the average outcome for plays is a net loss of 50 cents.D) A mistake must have been made because it?s;impossible for an expected value to be negative;48.;Suppose;that X=number of heads out of 12 independent flips of a fair coin. What is the;expected value of x?;A) 6B) 12 C) 5 D) 3;49.;The;purpose of having a control group in a study is;A) to;estimate the response when the treatment is not applied.B) to decrease the margin of error. C) to be able to blind the subjects. D) to make the samples more representative.;50.;Randomly;chosen 988 American adults participated in a poll regarding whether to approve;a new gun control legislation. What is the parmaeter of interest in this study?;A) the;proportion of American adults who approve the new gun control legislationB) the proportion of the 988 people who;approve the the new gun control legislation C) Is the new gun control legislation;beneficial to society D) the number of people in poll who were;against the new gun control legislation

Paper#62159 | Written in 18-Jul-2015

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