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##### QNT 351 FINAL EXAM

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Question;1) The main purpose of descriptive statistics is to;A. summarize data in a useful and informative manner;B. make inferences about a population;C. determine if the data adequately represents the;population;D. gather or collect data;2) The general process of gathering;organizing, summarizing, analyzing, and interpreting data is called;A. statistics;B. descriptive statistics;C. inferential statistics;D. levels of measurement;3) The performance of personal and business;investments is measured as a percentage, return on investment. What type of;variable is return on investment?;A. Qualitative;B. Continuous;C. Attribute;D. Discrete;4) What type of variable is the number of robberies;reported in your city?;A. Attribute;B. Continuous;C. Discrete;D. Qualitative;5) What level of measurement is the number of auto;accidents reported in a given month?;A. Nominal;B. Ordinal;C. Interval;D. Ratio;6) The names of the positions in a corporation, such;as chief operating officer or controller, are examples of what level of measurement?;A. Nominal;B. Ordinal;C. Interval;D. Ratio;7) Shoe sizes, such as 7B, 10D, and 12EEE, are;examples of what level of measurement?;A. Nominal;B. Ordinal;C. Interval;D. Ratio;8) Monthly commissions of first-year insurance;brokers are $1,270, $1,310, $1,680, $1,380, $1,410, $1,570, $1,180, and $1,420.;These figures are referred to as;A. a histogram;B. raw data;C. frequency distribution;D. frequency polygon;9) A small sample of computer operators shows;monthly incomes of $1,950, $1,775, $2,060, $1,840, $1,795, $1,890, $1,925, and;$1,810. What are these ungrouped numbers called?;A. Histogram;B. Class limits;C. Class frequencies;D. Raw data;10) The sum of the deviations of each data value;from this measure of central location will always be 0;A. Mode;B. Mean;C. Median;D. Standard deviation;11) For any data set, which measures of central;location have only one value?;A. Mode and median;B. Mode and mean;C. Mode and standard deviation;D. Mean and median;12) A sample of single persons receiving social;security payments revealed these monthly benefits: $826, $699, $1,087, $880;$839, and $965. How many observations are below the median?;A. 0;B. 1;C. 2;D. 3;13) A dot plot shows;A. the general shape of a distribution;B. the mean, median, and mode;C. the relationship between two variables;D. the interquartile range;14) The test scores for a class of 147 students are;computed. What is the location of the test score associated with the third;quartile?;A. 111;B. 37;C. 74;D. 75%;15) The National Center for Health Statistics;reported that of every 883 deaths in recent years, 24 resulted from an;automobile accident, 182 from cancer, and 333 from heart disease. Using the;relative frequency approach, what is the probability that a particular death is;due to an automobile accident?;A. 24/883 or 0.027;B. 539/883 or 0.610;C. 24/333 or 0.072;D. 182/883 or 0.206;16) If two events A and B are mutually exclusive;what does the special rule of addition state?;A. P(A or B) = P(A) + P(B);B. P(A and B) = P(A) + P(B);C. P(A and/or B) = P(A) + P(B);D. P(A or B) = P(A) - P(B);17) A listing of all possible outcomes of an;experiment and their corresponding probability of occurrence is called a;A. random variable;B. probability distribution;C. subjective probability;D. frequency distribution;18) The shape of any uniform probability;distribution is;A. negatively skewed;B. positively skewed;C. rectangular;D. bell shaped;19) The mean of any uniform probability distribution;is;A. (b - a)/2;B. (a + b)/2;C.? x/?;D. n?;20) For the normal distribution, the mean plus and;minus 1.96 standard deviations will include about what percent of the;observations?;A. 50%;B. 99.7%;C. 95%;D. 68%;21) For a standard normal distribution, what is the;probability that z is greater than 1.75?;A. 0.0401;B. 0.0459;C. 0.4599;D. 0.9599;22) A null hypothesis makes a claim about a;A. population;parameter;B. sample statistic;C. sample mean;D. Type II error;23) What is the level of significance?;A. Probability of a Type II error;B. Probability of a Type I error;C. z-value of 1.96;D. Beta error;24) Suppose we test the difference between two;proportions at the 0.05 level of significance. If the computed z is -1.07, what;is our decision?;A. Reject the null hypothesis;B. Do not reject the null hypothesis;C. Take a larger sample;D. Reserve judgment;25) Which of the following conditions must be met to;conduct a test for the difference in two sample means?;A. Data must be at least of interval scale;B. Populations must be normal;C. Variances in the two populations must be equal;D. Data must be at least of interval scale and;populations must be normal;26) Which of the following statements about the two;sample sizes is NOT true? Assume the population standard deviations are equal.;A. Sample A = 11, sample B = 13;B. Sample A = 12, sample B = 14;C. Sample A = 13, sample B = 13;D. Sample A = 10, sample B = 16;27) What is the chart called when the paired data;(the dependent and independent variables) are plotted?;A. Scatter diagram;B. Bar chart;C. Pie chart;D. Histogram;28) What is the variable used to predict the value;of another called?;A. Independent variable;B. Dependent variable;C. Correlation variable;D. Variable of determination;29) Twenty randomly selected statistics students;were given 15 multiple-choice questions and 15 open-ended questions, all on the;same material. The professor was interested in determining on which type of;questions the students scored higher. This experiment is an example of;A. a one sample test of means;B. a two sample test of means;C. a paired t-test;D. a test of proportions;30) The measurements of weight of 100 units of;a product manufactured by two parallel processes have same mean but the;standard of process A is 15 while that of B is 7. What can you conclude?;A. The weight of units in process A are grouped;closer than in process B;B. The weight of units in process B are grouped;closer than in process A;C. Both processes are;out of control;D. More data is needed to draw a conclusion

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