(a) Use the data of Exercise 7.3.3 on the running time of 20 driers set for 20 min to test the hypothesis µ = 20 versus µ f 20. Calculate the value of the test statistic T and carry out the test at...

(a) Use the data of Exercise 7.3.3 on the running time of 20

driers set for 20 min to test the hypothesis µ = 20 versus

µ f 20. Calculate the value of the test statistic T and

carry out the test at significance level 0.05 (approximately)

against a two-sided alternative.

(b) Carry out tests as in part (a) of µ = 21 and µ = 22 versus

two-sided alternatives at level of significance 0.05 approximately. Do your decisions agree with those in Exercise

7.3.37