(Steps Shown) A large insurance company selected a simple random sample of 64 policy holders in order to estimate the mean age of individual insured by
Question: A large insurance company selected a simple random sample of 64 policy holders in order to estimate the mean age of individual insured by the company. The sample mean was 39.5 years. Assume = 7.2.
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Find a 90% confidence interval for , the mean age of the population of policyholders.
- Find a 99% confidence interval for .
Deliverable: Word Document 
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Confidence Interval for the Difference Between Means Calculator - MathCracker.com