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Justin is interested in buying a digital phone. He visited 19 stores at random and recorded...
Justin is interested in buying a digital phone. He visited 19 stores at random and recorded the price of the particular phone he wants. The sample of prices had a mean of 240.65 and a standard deviation of 30.42.
(a) What t-score should be used for a 95% confidence interval
for the mean, μμ, of the distribution?
t* =
(b) Calculate a 95% confidence interval for the mean price of
this model of digital phone:
(Enter the smaller value in the left answer box.)
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