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 = 0.7 yÌ…₂+ 0.3yÌ…₃€“ yÌ…₁is significantly different from 0. What does the contrast mean? 

Nutrition

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.

Table 12.29: Protein intake (mg) among three dietary groups of postmenopausal women

 

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Mean Group sd 75 57 47 10 10 STD LAC VEG 13 17