12.23      For the experiment described in Exercise 12.6, what null and alternative hypotheses would be appropriate for the one-way ANOVA to examine the data? Given the fol- lowing data, what conclusion would be reached at the

0.05 level of significance? From the F distribution tables, what is the approximate p-value for this test? (Use data file  XR12023.)

 

 

Absences, Sample Members from the College of

12.16      For the one-way ANOVA model, xij 5 µ 1 Tj 1 Eij,                                                                                                             

explain the meaning of each term in the    equation,

then use the appropriate terms from the   equation in presenting and explaining the null and alternative hypotheses to be examined.

12.17       In terms of the assumptions required for using ANOVA, what is the special relevance of the value calculated for the error mean square, MSE?

12.18       On snow-covered roads, winter tires enable a  car to stop in a shorter distance than if summer tires were installed. In terms of the additive model for one-way ANOVA, and for an experiment in which the mean stopping distances on a snow-covered road are measured for each of five brands of winter tires, differentiate between the use of the terms “effectiveness” and “effect.”