Facial structure of CEOs. Refer to the Psychological Science (Vol. 22, 2011) study o...

Facial structure of CEOs. Refer to the Psychological Science (Vol. 22, 2011) study of a chief executive officer’s facial structure, Exercise 5.21 (p. 263). Recall that the facial width-to-height ratio (WHR) was determined by computer analysis for each in a sample of 55 CEOs at publicly traded Fortune 500 firms, with the following results:

a. Find and interpret a 95% confidence interval for the standard deviation, s, of the facial WHR values for all CEOs at publicly traded Fortune 500 firms. Interpret the result.

b. For the interval, part a, to be valid, the population of WHR values should be distributed how? Draw a sketch of the required distribution to support your answer.

Reference: Exercise 5.18