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A survey of 25 randomly selected customers found the ages shown (in years). The mean is...

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Statistics

A survey of 25 randomly selected customers found the ages shown(in years). The mean is 32.44 years and the standard deviation is10.17 years.

a) Construct a 90% confidence interval for the mean age of allcustomers, assuming that the assumptions and conditions for theconfidence interval have been met.

b) How large is the margin of error?

c) How would the confidence interval change if you had assumed thatthe standard deviation was known to be 11.0 years?

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