Question 7.43

7.43 Another two-sample -test.

Refer to Exercise 7.41 (page 382).

  1. Perform a significance test to see if there is a difference between the two sets of instructions using .
  2. Describe how you could use the 95% confidence interval you calculated in Exercise 7.41 to determine if the there is a difference between the two sets of instructions at significance level 0.05.

7.43

(a) . (b) . The data are not significant at the 5% level, and there is not enough evidence to show a difference between the two sets of instructions. (b) Because the confidence interval contains 0, we fail to reject .