4of the (a) What t-score should be used for a 95% confidence interval for the mean, distribution? T= (b) Calculate a 95% confidence interval for the mean price of this model of digital phone:

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Justin is interested in buying a digital phone. He visited 9 stores at random and recorded the price
of the particular phone he wants. The sample of prices had a mean of 270.17 and a standard
deviation of 26.4
(a) What t-score should be used for a 95% confidence interval for the mean,
distribution?
H, of the
T=
(b) Calculate a 95% confidence interval for the mean price of this model of digital phone:
MAY 3
22
W
Transcribed Image Text:Justin is interested in buying a digital phone. He visited 9 stores at random and recorded the price of the particular phone he wants. The sample of prices had a mean of 270.17 and a standard deviation of 26.4 (a) What t-score should be used for a 95% confidence interval for the mean, distribution? H, of the T= (b) Calculate a 95% confidence interval for the mean price of this model of digital phone: MAY 3 22 W
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