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Consider the population consisting of all computers of a certain brand and model, and focus on whether a computer needs service while under warranty.

a. Pose several probability questions based on selecting a sample of 100 such computers.

b. What inferential statistics question might be answered by determining the number of such computers in a sample of size 100 that need warranty service?

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Answer and explanation:

A. What is the probability that more than half of the sample of 100 computers would need warranty service?

What is the probability that more than half of the sample of 100 computers would not need warranty service?

What is the probability that out of sample of 100 more than 20% would require warranty service?

B. If our sample of 100 computers of that brand and model reveals that 30 computers need warranty service, does this give a valid conclusion that all such computers in the population would require about 30% warranty service or less?

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