A survey of 48 randomly selected iPhone owners showed that the purchase price has a mean of
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Question:
A survey of 48 randomly selected "iPhone" owners showed that the purchase price has a mean of $419 with a sample standard deviation of $180.
a. Compute the standard error of the sample mean. (Round the final answer to the nearest whole number.)
Standard error = 26 Ok
b. Compute the 80% confidence interval for the mean. (Round the final answers to 2 decimal places.)
The confidence interval is between $ _____ and $_______.
c. How large a sample is needed to estimate the population mean within $14 at a 80% degree of confidence? (Round the final answer to the nearest whole number.)
Sample size = 272 Ok
Related Book For
Statistical Techniques in Business and Economics
ISBN: 9781260239478
18th Edition
Authors: Douglas Lind, William Marchal, Samuel Wathen
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