Question

In a survey of randomly selected subjects, the mean age of 40 respondents is 36.4 years, and the sample standard deviation of all ages is known to be 10.1 years. Construct a 95% confidence interval estimate of the mean age of the population from which the sample was selected.

Answer 1

The standard error would be given by,

The degree of freedom would be given by,

df = n - 1 = 40 - 1 = 39

The critical probability would be given by,

The critical probability would be given by,

The margin of error would be given by,

The confidence interval would be given by,