You can perform hypothesis testing for the proportion of a population as long as the sample size is large enough. Recall from Chapter 13, that proportion data follows the binomial distribution, which can be approximated by the normal distribution under the following conditions:
*np* ≥ 5 and *nq* ≥ 5

where:
*p* = the probability of a success in the population
*q* = the probability of a failure in the population (*q* = 1 - *p*)

We will examine both one-tail and two-tail hypothesis testing for the proportion in the following sections.

Let’s say we would like to test the hypothesis that more than 30 percent of U.S. households have Internet access. ...

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