Question: Fifty cities provided information on vacancy rates (in percent) in local apartments in the following frequency distribution. The sample mean and the sample standard deviation are 9% and 3.6%, respectively.
Vacancy Rate (in percent) Frequency
Less than 6 10
6 up to 9 10
9 up to 12 20
12 or more 10
Apply the goodness-of-fit test for normality at the 5% significance level. Do the sample data suggest that vacancy rates do not follow the normal distribution?