Confidence Intervals for the Proportion with Large Samples
We can also estimate the proportion of a population by constructing a confidence interval from a sample. As you might recall from Chapter 13, proportion data follow the binomial distribution that can be approximated by the normal distribution under the following conditions:
p = the probability of a success in the population
q = the probability of a failure in the population (q = 1 - p)
Suppose I want to estimate the proportion of home shopping customers who are female based on the results of a sample. In Chapter 13, we learned that we can calculate the proportion of a sample using:
Calculating the Confidence Interval for the Proportion
The confidence ...