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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 31.96 years and the standard deviation is10.12 years.

​a) Construct a 95​% confidence interval for the mean age ofall​ customers, assuming that the assumptions and conditions forthe confidence 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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a Construct a 95 confidence interval for the meanage of all customers    See Answer
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