A sample size n of 22 male students in MS 150 had their body fat measured. The sample mean body fat x is 18.85 with a sample standard deviation sx of 8.63. Construct a 99% confidence interval for a population mean male body fat.
Statistic or Parameter | Symbol | Equations | Excel |
---|---|---|---|
Confidence interval statistics | |||
Find z from the area under the normal curve to the left of z | z | =NORMSINV(area to the left of z) | |
Calculate an x value from z, sx, n and a point estimate of µ | =z*sx/SQRT(n)+µ |