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Stocks Quiz

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Question 1 of 17 1.0 Points;An investor wants to compare the risks associated with two different stocks. One way to measure the risk of a given stock is to measure the variation in the stock?s daily price changes.;In an effort to test the claim that the variance in the daily stock price changes for stock 1 is different from the variance in the daily stock price changes for stock 2, the investor obtains a random sample of 21 daily price changes for stock 1 and 21 daily price changes for stock 2.;The summary statistics associated with these samples are: n1 = 21, s1 =.725, n2 = 21, s2 =.529.;If you compute the test value by placing the larger variance in the numerator, at the.05 level of significance, would you conclude that the risks associated with these two stocks are different?;A. No, the p-value associated with this test is 0.0528;B. No, the test value of 1.879 does not exceed the critical value of 2.46;C. Yes, the p-value associated with this test is 0.0264;D. No, the test value of 1.371 does not exceed the critical value of 2.12 Reset Selection;Question 2 of 17 1.0 Points;A researcher hypothesizes that the variation in the amount of money spent on business dinners is greater than the variation of the amount of money spent on lunches. The variance of nine business dinners was $6.12 and the variance of 12 business lunches was $0.87. What is the test value?;A. 7.03;B. 9.61;C. 3.10;D. 49.50 Reset Selection;Question 3 of 17 1.0 Points;Multiple myeloma or blood plasma cancer is characterized by increased blood vessel formulation in the bone marrow that is a prognostic factor in survival. One treatment approach used for multiple myeloma is stem cell transplantation with the patient?s own stem cells. The following data represent the bone marrow microvessel density for a sample of 7 patients who had a complete response to a stem cell transplant as measured by blood and urine tests. Two measurements were taken: the first immediately prior to the stem cell transplant, and the second at the time of the complete response.;Patient;1;2;3;4;5;6;7;Before;158;189;202;353;416;426;441;After;284;214;101;227;290;176;290;What is the p-value associated with the test of hypothesis you conducted?;A. p =.942597;B. p =.885014;C. p =.114986;D. p =.057493 Reset Selection;Part 2 of 8 -;Question 4 of 17 1.0 Points;In a simple linear regression analysis, the following sum of squares are produced;= 500;= 100;= 400;The proportion of the variation in Y that is explained by the variation in X is;A. 25%;B. 20%;C. 50%;D. 80% Reset Selection;Question 5 of 17 1.0 Points;Data for a sample of 25 apartments in a particular neighborhood are provided in the worksheet Apartments in the Excel workbook Apartments.xlsx. Using that data, find the estimated regression equation which can be used to estimate the monthly rent for apartments in this neighborhood using size as the predictor variable.;Apartments.xlsx;A. 177.12 + 1.065(size);B. 177.12 + 0.8500(size);C. 197.12 + 2.065(size);D. 1.065 + 177.12(size) Reset Selection;Question 6 of 17 1.0 Points;If an estimated regression line has a Y-intercept of ?7.5 and a slope of 2.5, then when X = 3, the actual value of Y is;A. 5;B. 10;C. 0;D. unknown Reset Selection;Question 7 of 17 1.0 Points;The correlation value ranges from;A. ?2 to +2;B. 0 to +1;C. ?1 to +1;D. -3 to +3 Reset Selection;Question 8 of 17 1.0 Points;is/are especially helpful in identifying outliers.;A. Scatterplots;B. Linear regression;C. Normal curves;D. Regression analysis Reset Selection;Part 3 of 8 -;Question 9 of 17 2.0 Points;A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the 0.10 level of significance, that the average trunk diameter of a pine tree is greater than the average diameter of a spruce tree?;Pine trees;Spruce trees;Sample size;30;35;Mean trunk diameter (cm);45;39;Sample variance;120;140;What is the test value for this hypothesis test?;Test value: Round your answer to three decimal places.;What is the critical value?;Critical value: Round your answer to three decimal places.;Part 4 of 8 -;Question 10 of 17 1.0 Points;The marketing manager of a large supermarket chain would like to determine the effect of shelf space (in feet) on the weekly sales of international food (in hundreds of dollars). A random sample of 12 equal ?sized stores is selected, with the following results;Store Shelf Space(X) Weekly Sales(Y);1 10 2.0;2 10 2.6;3 10 1.8;4 15 2.3;5 15 2.8;6 15 3.0;7 20 2.7;8 20 3.1;9 20 3.2;10 25 3.0;11 25 3.3;12 25 3.5;Find the equation of the regression line for these data. What is the value of the standard error of the estimate? Place your answer, rounded to 3 decimal places, in the blank. Do not use a dollar sign. For example, 0.345 would be a legitimate entry.;Question 11 of 17 1.0 Points;The marketing manager of a large supermarket chain would like to determine the effect of shelf space (in feet) on the weekly sales of international food (in hundreds of dollars). A random sample of 12 equal ?sized stores is selected, with the following results;Store Shelf Space(X) Weekly Sales(Y);1 10 2.0;2 10 2.6;3 10 1.8;4 15 2.3;5 15 2.8;6 15 3.0;7 20 2.7;8 20 3.1;9 20 3.2;10 25 3.0;11 25 3.3;12 25 3.5;Find the equation of the regression line for these data. What is the value of the coefficient of determination? Place your answer, rounded to 3 decimal places, in the blank. Do not use a dollar sign. For example, 0.345 would be a legitimate entry.;Part 5 of 8 -;Question 12 of 17 1.0 Points;An investor wants to compare the risks associated with two different stocks. One way to measure the risk of a given stock is to measure the variation in the stock?s daily price changes.;In an effort to test the claim that the variance in the daily stock price changes for stock 1 is different from the variance in the daily stock price changes for stock 2, the investor obtains a random sample of 21 daily price changes for stock 1 and 21 daily price changes for stock 2.;The summary statistics associated with these samples are: n1 = 21, s1 =.848, n2 = 21, s2 =.529.;If you follow Bluman's advice and place the larger variance in the numerator when computing the test value, at the.05 level of significance, what is the critical value associated with this test of hypothesis? Place your answer, rounded to 2 decimal places, in the blank. For example, 3.45 would be a legitimate entry.;Question 13 of 17 1.0 Points;Two teams of workers assemble automobile engines at a manufacturing plant in Michigan. A random sample of 145 assemblies from team 1 shows 15 unacceptable assemblies. A similar random sample of 125 assemblies from team 2 shows 8 unacceptable assemblies.;If you are interested in determining if there is sufficient evidence to conclude, at the 10% significance level, that the two teams differ with respect to their proportions of unacceptable assemblies, what is/are the critical value you would use to conduct such a test of hypothesis?;Place your answer, rounded to 2 decimal places, in the blank. If there are two critical values, place only the positive value in the blank. For example, 2.34 would be a legitimate entry.;Part 6 of 8 -;Question 14 of 17 3.0 Points;A professor gives an exam for which there are two versions, A and B. Each student in the class is given one randomly selected version of the exam. After the exam, the professor wishes to determine if there is a difference in the level of difficulty of the two versions by determining if there is a significant difference in the mean scores. Assume? = 0.05.;Version A;Version B;Sample size;45;65;Mean score;8.8;8.2;Sample variance;2.6;2.4;What is the test value for this hypothesis test?;Answer: Round your answer to two decimal places.;What is/are the critical value(s) for this hypothesis test? If there are two critical values, give only the positive value.;Answer: Round your answer to two decimal places.;What is the conclusion for this hypothesis test? Choose one.;1. There is not sufficient evidence to show that one version of the exam is more difficult than the other.;2. There is sufficient evidence to show that one version of the exam is more difficult than the other.;Answer: Enter only a 1 or 2 for your answer.;Part 7 of 8 -;Question 15 of 17 1.0 Points;When the necessary conditions are met, a two-tail test is being conducted to test the difference between two population proportions. The two sample proportions are = 0.35 and = 0.42, and the standard error of the sampling distribution of is 0.054. The calculated value of the test statistic is 1.2963.;True;False;Reset Selection;Part 8 of 8 -;Question 16 of 17 1.0 Points;In simple linear regression analysis, the relationship between the response variable Y and the explanatory variable X is a straight line. This means that all data points lie on the line.;True;False;Reset Selection;Question 17 of 17 1.0 Points;A negative relationship between an explanatory variable X and a response variable Y means that as X increases, Y decreases, and vice versa.;True;False;Reset Selection

 

Paper#35457 | Written in 18-Jul-2015

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