Refer to Exercise 6.15. In exercise a. Test for a difference in the means in the two populations using an = .05 t-test. b.

Refer to Exercise 6.15.
In exercise

a. Test for a difference in the means in the two populations using an α = .05 t-test.
b. Place a 95% confidence interval on the difference in the means of the two populations.
c. Compare the inferences obtained from the results from the Wilcoxon rank sum test and the t-test.
d. Which inferences appear to be more valid, inferences on the means or the medians?

Population A Population B 4.3 4.6 47 5.1 5.3 53 58 54 3.5 3.8 3.7 3.9 44 4.7 5 4.4