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Chapter 10: Q. 63 (page 599)

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 10.21. The “before” value is matched to an “after” value, and the differences are calculated. The differences have a normal distribution. Test at the 1% significance level.

What is the random variable?

Short Answer

Expert verified

The mean difference in system failures before and after installation is the random variable.

Step by step solution

01

Given information

The table is

02

Figure out what the random variable is

The random variable denotes the mean difference in system failure prior to and after installation.

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