Introductory Statistics (10th Edition)
10th Edition
ISBN: 9780321989178
Author: Neil A. Weiss
Publisher: PEARSON
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Textbook Question
Chapter 10.3, Problem 97E
A Better Golf Tee? An independent golf equipment testing facility compared the difference in the performance of golf balls hit
off a regular 2-3/4” wooden tee to those hit off a 3” Stinger Competition golf tee. A Calloway Great Big Bertha driver with 10 degrees of loft woo used for the test and a robot swung the club head at approximately 95 miles per hour. Data on ball velocity (in miles per hour) with each type of tee, based on the test results, are provided on the WeissStats site. Use the technology of your choice to do the following.
- a. Obtain normal probability plots, boxplots, and the standard deviations for the two samples.
- b. Based on your results from part (a), which would you be inclined to use to compare the population means: a pooled or a nonpooled t-procedure? Explain your answer.
- c. At the 5% significance level, do the data provide sufficient evidence to conclude that, on average, ball velocity is less with the regular tee than with the Stinger tee? Perform the required hypothesis test by using both the pooled t-test and the nonpooled t-test, and compare results.
- d. Find a 90% confidence interval for the difference between the
mean ball velocities with the regular and Stinger tees. Obtain the required confidence interval by using both the pooled t-interval procedure and the nonpooled t-interval procedure. Compare your results.
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Chapter 10 Solutions
Introductory Statistics (10th Edition)
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