Assume that each sample is obtained by randomly selecting values from a population with a normal distribution.
Refer to Data Set 4 in Appendix B.
a. Use the range rule of thumb (see Section 2-5) to estimate s, the standard deviation of the annual snowfall (in centimetres) of the first 31 cities (all except Victoria).
b. Construct a 99% confidence interval for σ.
c. Does the confidence interval contain your estimated value of σ?