A random sample of energy drinks had the following amounts of caffeine per fluid ounce. Assume the
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A random sample of energy drinks had the following amounts of caffeine per fluid ounce.
Assume the population standard deviation is σ = 24.
a. Explain why it is necessary to check whether the population is approximately normal before constructing a confidence interval.
b. Following is a dotplot of these data. Is it reasonable to assume that the population is approximately normal?
c. If appropriate, construct a 95% confidence interval for the mean amount of caffeine in all energy drinks. If not appropriate, explain why not.
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