In: Statistics and Probability
A simple random sample from a population with a normal distribution of 109 body temperatures has x=98.10 degrees F and s=0.67° F.
Construct a 99% confidence interval estimate of the standard deviation of body temperature of all healthy humans.
We have given here,
Sample standard deviation=0.67
Sample size =109
Degree of freedom =n-1= 108
Level of significance given =0.01
Chi square critical value for lower tail=73.899
Chi square critical value for upper tail=149.599
We can use here confidence interval formula for population standard
deviation
= (0.57,0.81
Lower confidence limit for population standard deviation=0.57
Upper confidence limit for Population standard deviation=0.81