Refer to Exercise 11.10. Let A and B, respectively, denote the mean scores at the end of

Refer to Exercise 11.10. Let μA and μB, respectively, denote the mean scores at the end of the semester for the populations of extremely hostile students who were treated throughout that semester by method A and method B.
a. Find a 95% confidence interval for μA.
b. Find a 95% confidence interval for μB.
c. Find a 95% confidence interval for (μA μB).
d. Is it correct to claim that the confidence intervals found in parts a, b, and c are jointly valid?
In Exercise 11.10.

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Method Scores on the HLT Test 73 83 76 68 80 54 74 71 79 95 87