Listed below are 10 randomly selected heights of supermodels. Do supermodels heights have less variation than women in general? Test the claim that, supermodels have heights with a standard deviation...

Listed below are 10 randomly selected heights of supermodels. Do supermodels heights have less variation than women in general? Test the claim that, supermodels have heights with a standard deviation that is less than 26 inches.
70, 71, 69, 68, 69, 70 71, 70 70, and 72

a) State null and alternative hypothesis
b) Test Statistics
c) P-value approach

d) Conclusion