According to the National Health Statistics Reports, a sample of 33 men aged 20–29 years had...

According to the National Health Statistics Reports, a sample of 33 men aged 20–29 years had a mean waist size of 36.9 inches with a sample standard deviation of 8.8 inches. What is the 95% confidence interval for the mean waist size?

Expert Solution

Solution :

Given that,

t /2,df = 2.037

Margin of error = E = t/2,df * (s / $\sqrt$ n)

= 2.037 * (8.8 / $\sqrt$ 33)

Margin of error = E = 3.1

The 95% confidence interval estimate of the population mean is,

- E < < + E

36.9 - 3.1 < < 36.9 + 3.1

33.8 < < 40

(33.8 , 40)

orchestra answered 2 years ago

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