Question: Suppose you are planning an experiment to test the effects of various diets on the weight gain of young turkeys. The observed variable will be

Suppose you are planning an experiment to test the effects of various diets on the weight gain of young turkeys. The observed variable will be Y = weight gain in 3 weeks (measured over a period starting 1 week after hatching and ending 3 weeks later). Previous experiments suggest that the standard deviation of Y under a standard diet is approximately 80 g. 23 Using this as a guess of σ, determine how many turkeys you should have in a treatment group, if you want the standard error of the group mean to be no more than
(a) 20 g
(b) 15 g

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