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Chapter 8: Q. 14 (page 482)

Refer to Exercise 12. As Gallup indicates, the 3percentage point margin of error for this poll includes only sampling variability (what they call “sampling error”). What other potential sources of error (Gallup calls these “non-sampling errors”) could affect the accuracy of the59% estimate?

Short Answer

Expert verified

The practical difficulty is:

Nonresponse bias is the result of not having data for everybody in the sample.

Step by step solution

01

Given Information

As Gallup indicates, the 3percentage point margin of error for this poll includes only sampling variability

02

Explanation

Some of the practical difficulties:

Selection bias will exclude part of the population

Measurement of response bias will use a method that gives different values from the true value

Nonresponse bias is the result of not having data for everybody in the sample.

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