Consider the following hypothesis statement using a = 0.10 and data from two independent samples. Assume the population variances are not equal and the populations are normally distributed.

H0 : m1 - m2 Ú 0 H1 : m1 - m2 6 0 x1 = 144.0 x2 = 156.3 s1 = 16.8 s2 = 27.0 n1 = 27 n2 = 21

a. Calculate the appropriate test statistic and interpret the result.

b. Approximate the p-value using Table 5 in Appendix A and interpret the results.

c. Determine the precise p-value using Excel.

d. Verify your results using PHStat.

AppendixLO1