Physical Sciences June temperatures in Phoenix, Arizona, routinely soar above 100°F, but residents claim that it is "dry" heat. The low humidity makes outside physical activity easier and attracts tourists, especially golfers, and retirees. The following table contains relative humidity data (percentages) for several days in June in Phoenix.37
a. Find a 95% confidence interval for the true variance in relative humidity in Phoenix.
b. Is there any evidence to suggest the data are from a non-normal distribution? Justify your answer.