Find the mean and median for each of the two samples, then compare the two sets of results. Cost of…

Find the mean and median for each of the two samples, then compare the two sets of results. Cost of…

Find the mean and median for each of the two samples, then compare the two sets of results.

Cost of Flying Listed 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. Does it make much of a difference if the tickets are purchased 30 days in advance or 1 day in advance?

 

30 Days in Advance:

244

260

264

264

278

318

280

1 Day in Advance:

456

614

567

943

628

1088

536

b) BMI for Miss America The 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 20.3 19.6 20.2 17.8 17.9 19.1 18.8 17.6 16.8

c) Nicotine in Cigarettes Listed below are the nicotine amounts (in mg per cigarette) for samples of filtered and nonfiltered cigarettes (from Data Set 4 in Appendix B). Do filters appear to be effective in reducing the amount of nicotine?

Nonfiltered:

1.1  1.7  1.7  1.1  1.1  1.4 1.1 1.4 1.0 1.2 1.1 1.1 1.1 1.1 1.1 1.8 1.6 1.1 1.2 1.5 1.3 1.1 1.3 1.1 1.1

Filtered:      

0.4  1.0  1.2  0.8  0.8  1.0 1.1 1.1 1.1 0.8 0.8 0.8 0.8 1.0 0.2 1.1 1.0 0.8 1.0 0.9 1.1 1.1 0.6 1.3 1.1

d) Customer Waiting Times Waiting 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

6.7

7.7

7.7

8.5

9.3

10.0

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