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Chapter 4: Q. 30 (page 239)

Seat belt use A study in El Paso, Texas, looked at seat belt use by drivers. Drivers were

observed at randomly chosen convenience stores. After they left their cars, they were

invited to answer questions that included questions about seat belt use. In all, 75% said

they always used seat belts, yet only 61.5% were wearing seat belts when they pulled into

the store parking lots. Explain why the two percentages are so different.

Short Answer

Expert verified

The two percentages are so different because of the biasing as bias makes the sample results not representative for the real situation.

Step by step solution

01

Given information

We need to explain that why the two percentages are so different.

02

Explanation

Selection or undercoverage bias excludes a portion of the population, measurement or response bias employs a method that yields numbers that differ from the real value, and nonresponse bias arises from the lack of data for everyone in the sample.

Most individuals will refuse to confess that they do not use a seat belt since they are aware that they should.

As a result, untruthful responses may be given, and measurement bias may be present in the sample. Bias causes sample results to be unrepresentative of the real world.

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Most popular questions from this chapter

Bias in a sampling method is

a. any difference between the sample result and the truth about the population.

b. the difference between the sample result and the truth about the population due to

using chance to select a sample.

c. any difference between the sample result and the truth about the population due to

practical difficulties such as contacting the subjects selected.

d. any difference between the sample result and the truth about the population that

tends to occur in the same direction whenever you use this sampling method.

e. racism or sexism on the part of those who take the sample.

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