I just need an explanation with the answers on numbers 13-15. Thanks In a recent

Question

I just need an explanation with the answers on numbers 13-15. Thanks

In a recent advertisement, Gillette claimed that their new Crazy Daisy shaver shaves legs smoother, closer, and safer than any other single-blade disposable razor for women. After shaving each leg with a different razor (Crazy Daisy versus the Lady Bic) according to their own routine, women rated each shaver on smoothness, closeness, and safety. A composite score of those three attributes ranging from 1-10 was used to test for overall average group differences. Assume the experiment was conducted three different times with three different groups of women. Answer the questions for each experiment using the following output. Answer or comment about the following for each experiment. 13. What determines if the variances need to be pooled in the test statistic? ____ 14. Which number from the output shows the pre-determined probability of a type-1 error? ____ 15. Which number from the output is compared to the critical value to check to see if the null hypothesis should have been rejected? ___

Explanation / Answer

13). If the variances are needed to be pooled in the test statistics then this implies that the populations from which samples are taken have nearly equal variance.

14) The value of level of significance is the pre-determined porbability of a type - I error.

15). The value of test statistic from the output is compared to the critical value to check if the null hypothesis should have been rejected.

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