Comparing Means TBL
We want to see whether the tar contents (in milligrams) for three different brands of cigarettes are different. Two different labs took samples, Lab Precise and Lab Sloppy.
The sample means from the two labs turned out to be the same. From which data set can you draw more conclusive evidence that the means from the three cigarette brands are different? Use the 5% significance level.
1. Data from Lab Precise (see Lab Precise.xlsx)
Tar Brand
10.21 A
10.25 A
10.24 A
9.8 A
9.77 A
9.73 A
11.32 B
11.2 B
11.4 B
10.5 B
10.68 B
10.9 B
11.6 C
11.9 C
11.8 C
12.3 C
12.2 C
12.2 C
2. Data from Lab sloppy (see Lab sloppy.xlsx)
Tar Brand
9.03 A
10.26 A
11.6 A
11.4 A
8.01 A
9.7 A
9.56 B
13.4 B
10.68 B
11.32 B
10.68 B
10.36 B
10.45 C
9.64 C
9.59 C
13.4 C
14.5 C
14.42 C
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