When using general stepwise regression, all possible combinations of independent variables are considered when choosing a final model.
Indicate whether the statement is true or false
Q. 2The National Center for Education would like to estimate the proportion of students who defaulted on their student loans for the state of Arizona.
The total sample size needed to construct a 95 confidence interval for the proportion of student loans in default with a margin of error equal to 4 is ________.A) 336
B) 416
C) 455
D) 601
Q. 3Edmunds.com would like to test the hypothesis that the standard deviation for the age of an imported car on the road is greater than the standard deviation for the age of a domestic car.
The following data shows the ages of a random sample of import and domestic cars.Import 1 3 4 5 4 5 10Domestic 4 5 4 6 5 4 6The standard deviation for the age of import cars would be ________.A) 2.76
B) 3.93
C) 4.72
D) 6.60
Q. 4When performing a hypothesis test to compare two or more population proportions, the expected frequencies must always be integer values.
Indicate whether the statement is true or false
Q. 5The Department of Education would like to test the hypothesis that the median debt load of graduating students with a Bachelor's degree is equal to 17,000.
The following table summarizes the debt load of a random sample of graduating students with a Bachelor's degree.Debt Load Number of Graduating StudentsBelow 17,000 31Equal to 17,000 1Above 17,000 22The appropriate nonparametric procedure for this analysis is the _________________ test.A) sign
B) Wilcoxon signed-rank
C) Kruskal-Wallis
D) Wilcoxon rank-sum
Q. 6A retail chain would like to test if a difference exists between the variability of customer satisfaction scores from two locations.
The following data represents satisfaction scores from a random sample of customers from these locations on a scale of 1-20.Location 1 12 14 20 18 15 17 16Location 2 18 19 17 18 16 20 Using = 0.10, the conclusion for this hypothesis test would be that because the test statistic is ____________________________.
A) more than the critical value, we fail to reject the null hypothesis and conclude that a difference exists between the variability of customer satisfaction scores from two locations
B) more than the critical value, we reject the null hypothesis and cannot conclude that a difference exists between the variability of customer satisfaction scores from two locations
C) less than the critical value, we can reject the null hypothesis and conclude that a difference exists between the variability of customer satisfaction scores from two locations
D) less than the critical value, we fail to reject the null hypothesis and cannot conclude that a difference exists between the variability of customer satisfaction scores from two locations
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