7. Suppose a study investigated the effects of vitamin A, vitamin C, and omega-3 fatty acids supplements on improving eye health and vision. 300 adults volunteered to take part in the study. In the study, participants were randomly assigned to one of 3 different levels of Vitamin A (Level A, Level B, or Level C) and randomly assigned to one of 2 different levels of Vitamin C (Level 1 or Level 2) and randomly assigned to one of 2 different levels of omega-3 fatty acid (Level I or Level II). a. Identify the subjects of the study. b. Identify the factor(s) for the study and the number of treatment level(s) for each factor. c. How many different treatment groups are there in this study?
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Answer A B C
The subject of the study is the impact of food supplement rich in vitamins A and vitamin C and Omega 3 fatty acid in improving vision and eye health.
Part b
The factors for the study are vitamin A, vitamin C and omega-3 fatty acid.
Number of treatment level for vitamin A = 3 (level A, level B, level C)
Number of treatment level for vitamin C = 2 (level 1 and 2)
Number of treatment level for Omega 3 fatty acids = 2 (level I and II)
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