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Chapter 12: Q. 56 (page 818)

Tattoos: What per cent of U.S. adults have one or more tattoos? The Harris Poll conducted an online survey of 2302adults and found 29% of respondents had at least 1 tattoo. According to the published report, 鈥淩espondents for this survey were selected from among those who have agreed to participate in Harris Interactive surveys.鈥� Explain why it would not be appropriate to use these data to construct a 95% confidence interval for the proportion of all U.S. adults who have tattoos.

Short Answer

Expert verified

The random condition was not met.

Step by step solution

01

Given information

Online survey of 2302 adults and found 29% of respondents had at least 1 tattoo.

02

Explanation

Independent, Random, and Normal are the three requirements for calculating the95% confidence interval for the proportion.

The sample was acquired using a voluntary response sample, which is not representative of the entire population, hence the random condition was not met.

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