Ms. Lisa Monnin is the budget director for Nexus Media Inc. She would like to compare the daily travel expenses for the sales staff and the audit staff. She collected the following sample information.

Sales ($) 146 134 148 157 134 147

Audit ($) 123 102 128 143 153 127 131

At the 0.050 significance level, can she conclude that the mean daily expenses are greater for the sales staff than the audit staff?

a. State the decision rule.

b. Compute the pooled estimate of the population variance

c. Compute the test statistic

d. Estimate the p-value.