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|