11.3 Semester GPAs are compared for seven randomly chosen students in each class level at Oxnard University. Does the data prove a significant difference in mean GPAs?

Accounting Finance Human Resources Marketing
2.48                3.16          2.93                   3.54
2.19                3.01          2.89                   3.71
2.62                3.07          3.48                   2.94
3.15                2.88          3.33                   3.46
3.56                3.33          3.53                   3.50
2.53                2.87          2.95                   3.25
3.31                2.85          3.58                   3.20

11.4 Sales of People magazine are compared over a 5-week period at four Borders outlets in Chicago. Does the data prove a significant difference in mean weekly sales?
Weekly Sales
Store 1, Store 2, Store 3, Store 4
102       97       89          100
106       77          91          116
105       82          75             87
115       80       106          102
112    101          94          100

11.6. Which pairs of mean examination times differ significantly (4 physicians)?

11.2 One particular morning, the length of time spent in the examination rooms is recorded for each patient seen by each physician at an orthopedic clinic. Does the data prove a significant difference in mean times?

Time in Examination Room (minutes)
Physician 1 Physician 2 Physician 3 Physician 4
34                   33                   17             28
25                   35                   30             33
27                   31                   30             31
31                   31                   26             27
26                   42                   32             32
34                   33                   28             33
21                                              26             40
                                                29
11.14 Engineers are testing company fleet vehicle fuel economy (miles per gallon) performance by using different types of fuel. One vehicle of each size is tested. Does this sample prove that there is a significant difference in treatment means?

               87 Octane 89 Octane 91 Octane Ethanol 5% Ethanol 10%
Compact    27.2          30.0          30.3          26.8             25.8
Mid-Size    23.0          25.6          28.6          26.6             23.3
Full-Size    21.4          22.5          22.2          18.9             20.8
SUV          18.7          24.1          22.1          18.7             17.4

11.16 A beer distributor is comparing quarterly sales of Coors Light (number of six-packs sold) at three convenience stores. Does this sample prove a significant difference in treatment means?

SECTION EXERCISES
            Store 1 Store 2 Store 3
Qtr 1    1,521    1,298    1,708
Qtr 2    1,396    1,492    1,382
Qtr 3    1,178    1,052    1,132
Qtr 4    1,730    1,659    1,851

11.3 Semester GPAs are compared for seven randomly chosen students...