7. An article in the journal Applied Nutritional Investigation reported the results of a comparison of two different weight-loss programs (Liao, 2007). In the study, obese participants were randomly assigned to one of two groups: (1) the soy group, a low-calorie group that ate only soy-based proteins, or (2) the traditional group, a low-calorie group, in which participants received 2/3 of their protein from animal products and 1/3 from plant products. One of the dependent measures collected was the amount of body fat loss as a percentage of initial body weight. Fictional data on the percent of body fat loss follows. These data produce results similar to those of the 2007 study (note that a smaller n than that used in the study is presented for ease of calculation).

Perform all six steps of the appropriate t-test on this set of data. Use = .05.

Soy Diet

2.5

1.7

2.5

1.9

2.0

3.2

Traditional Diet

1.21

0.86

1.78

1.23

0.50

1.76