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Chapter 4: Q 37. (page 230)

The Web portal AOL places opinion poll questions next to many of its news stories. Simply click your response to join the sample. One of the questions

in January 2008 was 鈥淒o you plan to diet this year?鈥� More than 30,000 people responded, with 68% saying 鈥淵es.鈥� You can conclude that

(a) about 68% of Americans planned to diet in 2008

(b) the poll used a convenience sample, so the results tell us little about the population of all adults.

(c) the poll uses voluntary response, so the results tell us little about the population of all adults.

(d) the sample is too small to draw any conclusion.

(e) None of these.

Short Answer

Expert verified

The correct option is (c).

Step by step solution

01

Given information

More than 30,000 people responded, with 68 percent indicating that they had planned their diet for the year.

02

Concept

A simple random sample (SRS) of size n is made up of n people chosen from the population with an equal chance of being the sample that is actually chosen.

03

Explanation

The participant is given the option of clicking an answer, which results in a voluntary response. As a result, there is the potential for a voluntary response bias. As a result of the poll's use of voluntary responses, the data reveal little about the adult population.

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