MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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The manufacturer of an MP3 player wanted to know whether a 10% reduction in price is enough to increase the sales of its product. To investigate, the owner randomly selected seven outlets and sold the MP3 player at the reduced price. At another seven randomly selected outlets, the MP3 player was sold at the regular price. Reported below is the number of units sold last month at the reduced and regular prices at the randomly selected outlets.

 

Number of units sold at Reduced price

138

137

125

131

137

131

130

Number of units sold at Regular price

135

135

120

130

130

135

120

 

At the .01 significance level, can the manufacturer conclude that average number of units sold at reduced price is more than average number of units sold at regular price?


a. What are the null and alternate hypotheses? (Choose 1, 2, or 3.) 

1.  H0μReduced ≤ μRegular  H1μReduced > μRegular
2. H0μReduced > μRegular  H1μReduced ≤ μRegular
3 H0μReduced ≤ μRegular  H1μReduced < μRegular

 

b. Compute the value of pooled variance (sp2).  (Round your answers to 3 decimal places.) 

 

c. Compute the test statistic.  (Round your answers to 3 decimal places.)

 

d. Write the decision rule: Reject H0 if t is greater than  (Round your answers to 3 decimal places.) 

 

e. What is your decision regarding the null hypothesis? (Choose 1 or 2.) 

1. Reject H0
2. Fail to reject H0

 

f. Interpret the result.  (Choose 1 or 2.) 

1. The sample data does provide evidence that the reduced price increased sales.
2. The sample data does not provide evidence that the reduced price increased sales.
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