Here are the alcohol percentages for a random sample of 16 beers (light beers excluded): 

a. Construct a normal probability plot of the data. Is it plausible that these values represent a sample from a normal distribution?
b. Calculate a 95% CI for the mean alcohol percentage of all nonlight beers.
c. Calculate a 95% CI for the mean amount of alcohol, in ounces, in a 12- oz. serving of (again, nonlight) beer.

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4.68 4.13 4.80 4.63 5.08 5.79 6.29 6.79 4.93 4.25 5.70 4.74 5.88 6.77 6.04 4.95