5. Inference review, problem 5 Aa Aa The Internal Revenue Service (IRS) would li

Question

5. Inference review, problem 5 Aa Aa 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 dispersion in the time it takes to fill out the new form is smaller than for the old form, what test can they use? O A t-test for the mean An F-test for difference in variances O A z-test for the difference in means O An independent samples t-test for difference in means (unequal variances) An independent samples t-test for difference in means (equal variances) O An F-test for difference in means O A z-test for population proportion O A chi-squared test for variance A paired sample t-test for difference in means O A z-test for the mean O A z-test for difference in proportions

Explanation / Answer

Here the same 50 people are filling both new and old standard form and hence, these samples will be dependent.

So we will apply paired sample t test here.

Option 9 is correct.

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