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Confidence interval estimate for mean of consumers age

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Reference no: EM131501321

Estimate Interval

The makers of a soft drink want to identify the average age of its consumers. A sample of 55 consumers was taken. The average age in the sample was 21 years with a sample standard deviation of 4 years. Please answer the following questions:

a. Construct a 95% confidence interval estimate for the mean of the consumers' age.

b. Suppose a sample of 71 was selected (with the same mean and the sample standard deviation). Construct a 95% confidence interval for the mean of the consumers' age.

Reference no: EM131501321

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