1. A study of the ability of individuals to walk in a straight line reported the accompanying data on
cadence (strides per second) for a sample of n = 20 randomly selected healthy men:
.95 .85 .92 .95 .93
.86 1.00 .92 .85 .81
.78 .93 .93 1.05 .93
1.06 1.06 .96 .81 .96
A normal probablity plot gives substantial support to the assumption that the population
distribution of cadence is normal.
Calculate and interpret 99% confidence intervals for population mean and standard deviation
cadence.
Solution
standard deviation =0.0788
And mean = 0.9255
and 99% confidence interval is{0.88 to 0.97}