The body mass index (BMI) for the sample of men and a sample of women are given below. Assume the samples are simple random samples obtained from populations with normal distributions.
Men: 32.8 26.7 20.1 28.8 23.1 29.6 27.7 28.9 31.5 20.7
Women: 18.9 17.4 22.2 33.5 17.1 20.2 18.2 38.1 18.8 18.2
Construct a 95% confidence interval estimate of the standard deviation of BMIs for Men.