Concept explainers
Refer to Exercise 11 in Section 5.6. Can you conclude that the variance of the sodium content differs between the two brands?
11. Measurements of the sodium content in samples of two brands of chocolate bar yield the following results (in grams):
Brand A 34.36 31.26 37.36 28.52 33.14
32.74 34.34 34.33 30.95
Brand B 41.08 38.22 39.59 38.82 36.24
37.73 35.03 39.22 34.13 34.33
34.98 29.64 40.60
Find a 98% confidence interval for the difference between the mean sodium contents of the two brands.
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