12. Inference review, problem 12 Aa Aa A study is undertaken to probe the varyin

Question

12. Inference review, problem 12 Aa Aa A study is undertaken to probe the varying levels of police brutality in the United States in 1980 compared to 2000. A random sample of 200 U.S. residents was interviewed in 1980, and a random sample of 350 was interviewed in 2000. Subjects were asked the following question: On a scale from 1 to 10, how well do police treat you? With the null hypothesis being that police brutality levels are the same in both years, which of the following tests should you use if you can perform only one test with these data? O An F-test for difference in means O A z-test for the difference in means An independent samples t-test for difference in means (unequal variances) O A z-test for difference in proportions O An independent samples t-test for difference in means (equal variances) O A chi-squared test for variance A t-test for the mean A paired sample t-test for difference in means O A z-test for the mean O A z-test for population proportion O An F-test for difference in variances

Explanation / Answer

as sample size is high and only one test is required:

we can use a z-test for difference in means.

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