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Chapter 1: Q3E (page 12)

Consider the population consisting of all computers of acertain brand and model, and focus on whether a computerneeds 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 answeredby determining the number of such computers in a sample of size 100 that need warranty service?

Short Answer

Expert verified

a.What is the expected number among the 100 that need warranty service.

b.Does the sample provide compelling evidenceforconcluding that more than 10% of all such computersneed warranty service?

Step by step solution

01

Given information

The population consists of all computers of a certain brand and model.

02

State the probability questions

a.

1)What is the expected number among the 100 that need warranty service.

2) How likely is it that the number needing warrantyservice will exceed the expected number by more than 10?

3)How likely is it that more than half of the sampled computerswill need or have needed warranty service?

03

State the inferential statistics questions

b.

Suppose that 15 of the 100 sampled needed warrantyservice. How confident can we be that the proportion ofallsuch computers needing warranty service is between.08 and .22? Does the sample provide compelling evidenceforconcluding ;that more than 10% of all such computersneed warranty service?

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