A random sample of 11 smartphones sold over the Internet had the following prices, in dollars: Assume
Question:
A random sample of 11 smartphones sold over the Internet had the following prices, in dollars:
Assume the population standard deviation is σ = 85.
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 price for all phones of this type being sold on the Internet. If not appropriate, explain why not.
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