Justin is interested in buying a digital phone. He visited 13 stores at random and recorded the price of the particular phone he wants. The sample of prices had a mean of 378.13 and a standard deviation of 10.3.(a) What t-score should be used as the multiplier for a 95% confidence interval for the mean, μ, 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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