12. Inference review... problem 12 M pa 3 A study is undertaken to probe the varying levels of police brutality in the United States in 193D compared to 2ooo. A random sample of 2:111] U.S. residents was interviewed in 1930. and a random sample of EEG was interviewed in soon. Subjects were asked the following question: (in a scale from 1 to 1:]. how well do police treat you? with the null hypothesis being that police brutalityr levels are the same in both years, and failing to reject the null hypothesis for the F-test. which of the following tests should you use? A paired sample t-test for difference in means A z-test for populao'on proportion An F-test for difference in means An independent samples t-test for difference in means {unequal variances) A chi-squared test for variance An F-test for difference in yarianoes A ttest for the mean A z-test for the mean A z-test for difference in proportions A z-test for the difference in means An independent samples t-test for difference in means {equal variances) 00000000000 11. Inference review, problem 11 M A3 a An educational testing company claims that its course will improve SAT scores by more than 1241] points on average. You set out to test whether this is an accurate statement. You gather a sample of SAT scores from 35 students who took the course and 48 students who did not. You reject the null hypothesis for the F-test. with only this information provided. which of the following should you perform? An independent samples t-test for difference in means {equal ya riances) A z-test for the difference in means An independent samples t-test for difference in means {unequal variances) An F-test for difference in variances An F-test for difference in means A z-test for the mean A chi-squared test for variance A t-test for the mean A paired sample t-test for difference in means A ztest for difference in proportions A z-test for population proportion 00000000000 15. Inference review, problem 15 Aa Aa E Suppose you are the owner of a chain of pizza restaurants. You want to expand operations to the city of Decatur, but will open a new branch only if the average income per capita in the city is larger than $60,000 a year. You collect data on a random sample of residents of Decatur, asking what is their yearly income (measured in dollars). Given this information, what test would be most appropriate? 0 A z-test for the mean 0 A z-test for difference in proportions O A z-test for the difference in means 0 A paired sample t-test for difference in means 0 An independent samples t-test for difference in means (unequal variances) 0 An F-test for difference in means 0 A chi-squared test for variance 0 A t-test for the mean 0 A z-test for population proportion 0 An independent samples t-test for difference in means (equal variances) 0 An F-test for difference in variances