1. Guide to Using Minitab 14 For Basic Statistical Applications
To Accompany
Business Statistics: A Decision Making Approach, 6th Ed.
Chapter 10:
Estimation and Hypothesis Testing for Two Population Parameters By
Groebner, Shannon, Fry, & Smith
Prentice-Hall Publishing Company
Copyright, 2008

2. Chapter 10 Minitab Examples
Hypothesis Tests – Two Means
SUV Mileage
Hypothesis Testing – Two Proportions Pomona Fabrications

3. Hypothesis Test – Two Means SUV Vehicle Mileage
Issue: A national car rental agency wishes to test whether SUV vehicles have different mean city mileage versus highway mileage. The premise is that mean highway mileage will exceed mean city mileage
Objective: Use Minitab to help test the hypothesis for the difference in population means.
Data file is Mileage.MTW

4. Hypothesis Test – SUV Vehicle Mileage
Open the file Mileage.MTW.
The null and alternative hypothesis to be tested are:

5. Hypothesis Test – SUV Vehicle Mileage
After clicking on Graph, select Boxplot for visual check of normality assumptions

6. Hypothesis Test – SUV Vehicle Mileage
Select Multiple Y’s - Simple

7. Hypothesis Test – SUV Vehicle Mileage
Select variables to graph

8. Hypothesis Test – SUV Vehicle Mileage
Resulting Boxplots

9. Hypothesis Test – SUV Vehicle Mileage
Go to Stat, click on Basic Statistics, then 2-Sample t

10. Hypothesis Test – SUV Vehicle Mileage
Specify variables for analysis and check Assume equal variances, then click on Options

11. Hypothesis Test – SUV Vehicle Mileage
Specify confidence level, hypothesized mean, and form of the alternative

12. Hypothesis Test – SUV Vehicle Mileage
Hypothesis Test results. Since t-value = 2.52 is associated with a p-value of 0.007, reject the null hypothesis

13. Hypothesis Testing – Two Proportions - Pomona Manufacturing
Issue: The research and development department needs to determine whether the new, redesigned motor-heater is more reliable than the current unit.
Objective: Use Minitab to help conduct a hypothesis test about the difference between two population proportions. No data is required for this test.

14. Hypothesis Testing – Pomona Manufacturing
Click on Stat – then Basic Statistics – then 2 Proportions.

15. Hypothesis Testing – Pomona Manufacturing
Choose Summarized data, enter Sample Size and Number of Successes for each population. Click on options.

16. Hypothesis Testing – Pomona Manufacturing
Indicate the Confidence Level (1- α), the Hypothesized Difference, and the alternative hypothesis.
Check “Use Pooled estimate….

17. Hypothesis Testing – Pomona Manufacturing
The Lower Tail Test shows the null hypothesis should be rejected.