Ex8.1B

Diet B n 50

Mean 3.710

SD 2.769

The average weight loss for Diet B is 3.710, the SD is 2.769

since the mean weight loss is not larger than 2SD, then the diet doesnt look to be very effective

Exe8.2B

Diet B n 50

Mean 3.710

SD 2.769

Median 3.745

Q1 1.953

Q3 5.404

IQR 3.451

The sample median for Diet B is M = 3.745, so the diet looks effective but not as effective as Diet A

The mean and median are very close, implying a roughly symmetric distribution

The IQR is close to the median, indicating moderate spread in the middle 50% of the data

If the goal of Diet B is to consistently achieve results around 3.7, then it appears effective

Exe8.3B

Frequencies

Area 1 Area 2

A 11 19

B 17 30

Other 42 41

Total 70 90

Percentages

Area 1 Area 2

A 15.7 21.11111111

B 24.3 33.33333333

Other 60.0 45.55555556

Total 100 100

Regarding Area2, of the 90 respondents in Area 2, 21.11% preferred Brand A, 33.33% preferred Brand B, and the remaining 45.55% preferred some other brand of breakfast cereal.