Estimate Interval

The makers of a soft drink want to identify the average age of its consumers. A sample of 61 consumers was taken. The average age in the sample was 22 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 85 was selected (with the same mean and the sample standard deviation). Construct a 95% confidence interval for the mean of the consumers age.