A medical researcher wants to determine whether male pulse rates vary more or less than female pulse rates. Using the sample pulse rates in Data Set 1 in Appendix B, the male pulse rates can be
summarized with the statistics
40=n,69.4=x,11.3=s.
For females, the statistics are,40=n,76.3=x, 12.5=s Assume that each sample is a simple random sample obtained from a population
with a normal distribution.
a) Construct a 90% confidence interval estimate of the population standard deviation σ of pulse rates for males.
b) Construct a 90% confidence interval estimate of the population standard deviation of pulse rates for females.
c) Compare the preceding results.
Does it appear that the population standard deviations for males and females are different? Why or why not?
1 answer