# Confidence intervals for the estimation of population mean

The mean age of a sample of 60 students from a class was found out to be 25.3 years. The variance in population age was 16 years.

(a) Calculate a point estimate for the population mean

(b) Find the 95% Confidence interval for the population mean.

(c) Find the 99% Confidence interval for the population mean.

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#### Solution Preview

The mean age of a sample of 60 students from a class was found out to be 25.3 years. The variance in population age was 16 years.

(a) Calculate a point estimate for population mean

(b) Find the 95% Confidence interval for .

(c) Find the 99% Confidence interval for .

Solution: years, , n = 60

(a) Point estimate for

(b) Find the 95% Confidence interval for .

Finding the confidence interval for population ...

#### Solution Summary

The expert examines confidence intervals for the estimation of population means.