Chapter 12.2, Problem 50E

To determine

To figure out: the percentage of U.S. adults with one or more tattoos and explain the reason that it would not be acceptable to use such statistics to create a 95 percent confidence interval for the proportion of all U.S. adults with tattoos.

Answer to Problem 50E

Not fulfilled the random condition

Explanation of Solution

There are three conditions for a confidence interval of 95 per cent for Proportion: Random, Independent and Normal.

The random condition was not fulfilled, since the sample was taken by a group of voluntary responses which is not indicative for the whole population. 

Hence, the correct option is (b)