
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Transcribed Image Text:A survey of 39 randomly selected iPhone owners showed that the purchase price has a mean of $690 with a sample standard
deviation of $38. (Use z Distribution Table.)
a. Compute the standard error of the sample mean. (Round your answer to the nearest whole number.)
Standard error
b. Compute the 95% confidence interval for the mean. (Use tDistribution Table.) (Round your answers to 3 decimal places.)
The confidence interval is
and
between
c. To be 95% confident, how large a sample is needed to estimate the population mean within $6? (Round up your answer to the next
whole number.)
Sample size
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