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Problem

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Textbook Expert
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.

To find the  press STAT and  

 Twice to select .

 Press followed by to enter stat list editor,

Enter the list for before and after values and in the third list, go-to name list and enter and then press ENTER after each value. The data is given below,

Once all the sample entries are made press  to obtain the results as,

Test level significance is  

Therefore,   not to reject the null hypothesis.

And the is  .  

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