In matched-pairs tests, the focus of the hypotheses is on the mean difference μd.

Sample A has s = 2.4. Sample B has s = 4.8. Compute the F test statistic after proper labeling. Round to 3 decimals.

A newspaper claims there is no difference between Dee’s and Tom’s mean ratings. Dee’s sample has x̄1 = 4.7, s1 = 0.50, n1 = 100. Tom’s sample has x̄2 = 4.8, s2 = 0.62, n2 = 100. Use α = 0.01 with two-tail critical values ±2.576. Is the claim supported? Answer “supported” or “not supported”.

In the summer-job study, p̂male = 725/802 and p̂female = 573/712. What is the approximate TS for males as Sample 1?

A two-sample mean test has n1 = 30 and n2 = 31. What df should be used?

Sample A has s = 5.5. Sample B has s = 3.0. Compute the F test statistic after proper labeling. Round to 3 decimals.

Critical value for a two-sample variance test. Answer with the appropriate Excel function used in this case.

Left-tail F tests are allowed if the claim is written carefully.

A left-tail matched-pairs test has critical value -2.326 and TS = -0.840. Decision: ______. Answer “reject H0” or “fail to reject H0”.

Tom’s Burgers claims that customers like Dee’s Burgers less than they like Tom’s Burgers. Which hypothesis pair correctly represents the claim if Dee’s mean rating is listed first?