Find thecoefficient of variation for each of the two sets of data, then compare the variation. (The same data were
used in Section 3-2.)
a) Cost of FlyingListed below are costs (in dollars) of roundtrip flights from JFK airport in New York City to San Francisco. All flights involve one stop and a two-week stay. The airlines are US Air, Continental, Delta, United, American, Alaska, and Northwest.
30 Days in Advance:
244
260
264
278
318
280
1 Day in Advance:
456
614
567
943
628
1088
536
b)BMI for Miss AmericaThe trend of thinner Miss America winners has generated charges that the contest encourages unhealthy diet habits among young women. Listed below are body mass indexes (BMI) for Miss America winners from two different time periods.
BMI (from the 1920s
and 1930s):
20.4
21.9
22.1
22.3
20.3
18.8
18.9
19.4
18.4
19.1
BMI (from recent
winners):
19.5
19.6
20.2
17.8
17.9
17.6
16.8
c)Nicotine in CigarettesListed below are the nicotine amounts (in mg per cigarette) for samples of filtered and non-filtered cigarettes (from Data Set 4 in Appendix B).
Non-filtered:
1.1
1.7
1.4
1.0
1.2
1.8
1.6
1.5
1.3
Filtered:
0.4
0.8
0.2
0.9
0.6
d)Customer Waiting TimesWaiting times (in minutes) of customers at the Jefferson Valley Bank (where all customers enter a single waiting line) and the Bank of Providence (where customers wait in individual lines at three different teller windows) are listed below. Determine whether there is a difference between the two data sets that is not apparent from a comparison of the measures of center. If so, what is it?
Jefferson Valley (single line):
6.5
6.6
6.7
6.8
7.1
7.3
7.4
7.7
7.7 7.7
Providence (individual lines):
4.2
5.4
5.8
6.2
8.5
9.3 10.0
Already registered? Login
Not Account? Sign up
Enter your email address to reset your password
Back to Login? Click here