Justin is interested in buying a digital phone. He visited 9stores at random and recorded the price of the particular phone hewants. The sample of prices had a mean of 337.63 and a standarddeviation of 30.04.
(a) What t-score should be used as the multiplier for a 95%confidence interval for the mean, ?, of the distribution?
t =
(b) Calculate a 95% confidence interval for the mean price ofthis model of digital phone:
(Enter the smaller value in the left answer box.)
___ to ___
