SOLUTION: Please help me understand this problem I am having major difficulties understanding this! Chapter 11: Two-Sample Tests of Hypothesis 17) Ms. Lisa Monnin is the budget directo

Question 123658This question is from textbook Statistical Techniques in Business and Economics,
: Please help me understand this problem I am having major difficulties understanding this!
Chapter 11: Two-Sample Tests of Hypothesis
17) 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 ($) 131 135 146 165 136 142

Audit ($) 130 102 129 143 149 120 139

At the .10 significance level, can she conclude that the mean daily expenses are greater for the sales staff than the audit staff? What is the p-value?

This question is from textbook Statistical Techniques in Business and Economics,

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
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 ($) 131 135 146 165 136 142
Audit ($) 130 102 129 143 149 120 139
At the .10 significance level, can she conclude that the mean daily expenses are greater for the sales staff than the audit staff? What is the p-value?
-------------------------------
These are independent data sets. Use a 2-sample t test.
--------------------------------
Ho: mu(sales)-mu(audit) =0
Ha: mu(sales)-mu(audit) >0
-------------------
t(142.5-130.285) = 1.569177
p-value = 0.07255..
----------
Conclusion: Since p-value < alpha=0.10, reject Ho.
There is significant statistical evidence that the
mean daily expenses are greater for the sales staff
than the audit staff.
==================
Cheers,
Stan H.

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