5. Inference review, problem 5 AaAa The Internal Revenue Service (IRS) would lik

Question

5. Inference review, problem 5 AaAa The Internal Revenue Service (IRS) would like to reduce the amount of time it takes for the public to fill out their tax forms. IRS researchers produce a new form and also have the old standard form. For each form, they have a sample of 50 people fill it out, and they record the amount of time each person takes to complete it. If they want to determine whether the percentage of people taking less than 30 minutes to complete the new form is more than 5% greater than for the old one, what test can they use? O An F-test for difference in means O A chi-squared test for variance An independent samples t-test for difference in means (equal variances) A paired sample t-test for difference in means O A z-test for population proportion O A z-test for the mean O An independent samples t-test for difference in means (unequal variances) O A z-test for difference in proportions O An F-test for difference in variances O A z-test for the difference in means O A t-test for the mean

Explanation / Answer

as above is a test of difference of proportion among two samples

therefore a z test for difference in proportions

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