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29 Nov 2021
Problem 63
Page 558
Section: PRACTICE
Chapter 10: HYPOTHESIS TESTING WITH TWO SAMPLE
Textbook ExpertVerified Tutor
29 Nov 2021
Given information
Use the following information to answer the next five exercises. A study was conducted to test the effectiveness of a software patch in reducing system failures over a six-month period. Results for randomly selected installations are shown in Table 
. The “before” value is matched to an “after” value, and the differences are calculated. The differences have a normal distribution. Test at the 
significance level.
Step-by-step explanation
Step 1.
The system failures mean difference before and after installations is the random variable.
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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208
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