Researchers compared protein intake among three groups of postmenopausal women: (1) women eating a standard American diet (STD), (2) women eating a lactoovo- vegetarian diet (LAC), and (3) women eating a strict vegetarian diet (VEG). The mean ± 1 sd for protein intake (mg) is presented in Table 12.29. 12.4 Suppose that in the general population, 70% of vegetarians are lacto-ovo-vegetarians, whereas 30% are strict vegetarians. Perform a statistical procedure to test whether the contrast L = 0.7y2 + 0.3y3 − y1 is significantly different from 0. What does the contrast mean?
Researchers compared protein intake among three groups of postmenopausal women: (1) women eating a standard American diet (STD), (2) women eating a lactoovo- vegetarian diet (LAC), and (3) women eating a strict vegetarian diet (VEG). The
12.4 Suppose that in the general population, 70% of vegetarians are lacto-ovo-vegetarians, whereas 30% are strict vegetarians. Perform a statistical procedure to test whether the contrast L = 0.7y2 + 0.3y3 − y1 is significantly different from 0. What does the contrast mean?
12.5 Using the data in Table 12.29, perform a multiplecomparisons procedure to identify which specific underlying means are different.
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