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Confidence interval for the above distribution

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Reference no: EM132461953

You have decided to open a new Pub called Moe's. Your research tells you that the majority of your patrons will be 25 or younger. You decided to calculate the average age of people living close to your Pub. You sample 25 people and calculate an average age of 26 with a standard deviation of 6 years. You are certain the distribution is normal.

a. Calculate the 95% confidence interval for the above distribution.

b. Calculate the 90% confidence interval for the above distribution.

c. Suppose you wanted to calculate the average age so that your margin of error was within 1.5 years at the 95% level of confidence. How large a sample must you choose?

Reference no: EM132461953

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