Question

In a study, 272 moderately obese subjects were randomly assigned to one of three diets: low-fat, restricted-calorie; Mediterranean, restricted-calorie; or low-carbohydrate, nonrestricted-calorie. The prediction was that subjects on a low-carbohydrate diet would lose weight, on average. After two years, the mean weight loss was 5.5 kg for the 109 subjects in the low-carbohydrate group with a standard deviation of 7.0 kg. The technology output below shows results of a significance test for testing H0: Î¼=0 against Ha: Î¼â‰ 0, where Î¼ is the population mean weight change. Note that weight change is determined by calculating after weight minus before weight. Complete parts a through c below. N Mean StDev SE Mean 95% CI T P 109 -5.500 7.000 0.670 (-6.829, -4.171) -8.20 0.000

          In a study, 272 moderately obese subjects were randomly assigned to one of three diets: low-fat, restricted-calorie; Mediterranean, restricted-calorie; or low-carbohydrate, nonrestricted-calorie. The prediction was that subjects on a low-carbohydrate diet would lose weight, on average. After two years, the mean weight loss was 5.5 kg for the 109 subjects in the low-carbohydrate group with a standard deviation of 7.0 kg. The technology output below shows results of a significance test for testing H0: Î¼=0 against Ha: Î¼â‰ 0, where Î¼ is the population mean weight change. Note that weight change is determined by calculating after weight minus before weight. Complete parts a through c below.

N
Mean
StDev
SE
Mean
95% CI
T
P
109
-5.500
7.000
0.670
(-6.829, -4.171)
-8.20
0.000

Added by Earl A.

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