An analyst surveyed 150 stores to find out the price of replacement cell phone batteries. Some stores sold the batteries
at prices higher than the mean of $23.70. The sample proportion of the expensive stores is 0.22. What is the population
proportion of stores labeled as expensive? Use a 95% confidence level, with z = 1.96.
11.1% to 18.7%
12.8% to 23.2%
15.4% to 28.6%
0.187% to 0.321%