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

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Basic Math

A survey of 25 randomly selectedcustomers found the ages shown? (in years). The mean is 32.32 yearsand the standard deviation is 10.66 years.?

a) Construct a 99% confidence interval for the mean age of all?customers, 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 assumedthat the standard deviation was known to be 11.0 ?years?

Answer & Explanation Solved by verified expert
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Solution Given in the question Total no of samples 25 Mean 3232 Standard deviation 1066 alpha 001 and alpha2 0005 Here sample size is 25 and less than 30 so we    See Answer
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