Question

A major automobile manufacturer claimed that the frequencies of repairs on all five models of its cars are the same A sample of 200 repair services showed the following frequencies on the various makes of cars Difference Squared Divided by Difference Observed Hypothesized Proportion Expected Expected Category Frequency Difference Squared Frequency 1.600 625 -8 64 32 40 25 45 40 225 43 40 900 36 -6 34 40 36 6. 46 34 Refer to Exhibit 12-1. What is the value of the test statistic? 4.25 a. b. 170 200 None of the Above 35 Refer to Exhibit 12-1. At a level of significance of 05, what conciusion can be drawn? There is a significant difference between repair rates of these models There is no significant difference between the repair rates of these models The repair rates are similar for these models There is a significant difference between 2 of the repair rates of these models 36 Stratified random sampling is a method of selecting a sample in which the sample is first divided into groups, and then random samples are taken from each group various strata are selected from the sample the population is first divided into groups, and then random samples are drawn from each group None of the alternative ANSWERS is correct 37 The manager of the service department of a local car dealership has noted that the service times of a sample of 15 new automobiles has a standard deviation of 4 minutes. A 95% confidence interval estimate for the standard deviation of the population is a. 1.46 to 3 15 2. 85 to 5 98 2 93 to 6 31 8.58 to 39.79 None of the Above 38 A linear regression line has been constructed y = -3.Lx +14.5 and the coefficient of determination is 8367. What is the correlation coefficient for the this linear regression line? a. 7001 - 7001 9147 - 9147 None of the above. b. C. d.

Answer 1

Solution:

maior automobile manufacturer claimed that the frequencies of repairs on all five models of its cars are the Game A sample of 200 repair services showed the following frequencies on the various makes of cars Difference Squared Divided Category Hypothesized Proportion Observed Frequency Expected Frequency Difference Difference Squared Expected 0.2 0.2 40 40 0.2 MOOC 40 1.600 .625 225 900 0.900 Total = 4.25 0.2 90 12-1 What is the value of the test statistic? a 425 170 200 None of the Above 35 option b Refer to Exhibit 12-1. At a level of significance of 05. what conclusion can be drawn? There is a significant difference between repair rates of these models There is no significant difference between the repair rates of these models The repair rates are similar for these models There is a significant difference between 2 of the repair rates of these models Stratified random sampling is a method of selecting a sample in which option C the sample is first divided into groups, and then random samples are taken from each group Various strata are selected from the sample the population is first divided into groups and then random samples are drawn from each group None of the alternative ANSWERS is correct (15–1)4? cox |(15–14 The manager of the service department of a local car dealership has noted that the service times of a sample of 15 new automobiles has a standard deviation of 4 minutes. A 95% confidence interval estimate for the standard deviation of the population is 1.46 to 3 15 2.85 to 5.98 2 93 to 6 31 8 58 to 39.79 None of the Above 2.93 to 6.31 224 38 224 V26.119 V5.629 2.93<o<6.31 A linear regression line has been constructed y=-3.1x +14.5 and the coefficient of determination is 8367 What is the correlation coefficient for the this linear regression line? 7001 b - 7001 9147 -0.9147 - 9147 None of the above r=-0.8367 = -0.9147