Problem 4: waiting times (in minutes) of customers at a bank where all customers enter a single waiting line and a bank where customers wait in individual lines at three different teller windows are listed below. Find the coefficient of variation for each of the two sets of data, then compare the variation. Round results to one decimal place as needed.

Bank A (single line) : 6.6 6.7 6.7 6.8 7.0 7.3 7.5 7.7 7.7 7.7

Bank B (individual line): 4.1 5.5 5.8 6.3 6.6 7.7 7.8 8.5 9.4 9.8

1. Find the coefficient of variance of the two samples:

Age	s cv= 100% x	STATCRUNCH COMMANDS FOR COEF. OF VARIATION: ONLY WITH DATA SET Input bank A values in one column. Go to Stat < Summary Stats Same for Bank B!
Bank A
Bank B

1. Compare the results: (Circle the answer of your choice)

A.The waiting times at bank B have considerably less variation than bank A.

B.The waiting times at bank A have considerably less variation than bank B.

Problem 1:Z score:

When Steve Jobs was Chief Executive Officer (CEO) of Apple, he earned an annual salary of $1. The CEOs of the largest U.S. companies had a mean salary of $1,449,779 and a standard deviation of $527,651 (based on data from USA Today). a)Find the z score for Steve Job's salary. _______________________

b)If we consider "usual' salaries to be those that convert to z scores between -2 and 2, is Steve Jobs' salary usual or unusual? ____________________