Question: An efficiency expert employed by a multinational corporation wanted to investigate the variability in the amount of time executives and middle managers spend reviewing their electronic messages at the start of their business day. In particular, is the amount of time the executives spend reading messages more variable than that for middle managers? She wants to make this claim with a confidence level of 95%. Consider the following data, expressed in minutes, collected from random samples from both populations:

Test whether or not the time executives spend reviewing their electronic messages at the start of the work day is more variable than the time spent by middle managers. [COMMENTS & HINTS: Which inferential test and accompanying continuous probability distribution is most appropriate when comparing two variances? Use technology (e.g., calculator or spreadsheet) to compute both sample standard deviations and avoid tedious manual calculations. What level of significance corresponds to a confidence level of 95%?]