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Problem

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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 following is a graph of the .

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