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Imagine that one of the following 95 percent confidence intervals estimates the effect of vitamin C on IQ scores:

Imagine that one of the following 95 percent confidence intervals estimates the

effect of vitamin C on IQ scores:

(a) Which one most strongly supports the conclusion that vitamin C increases IQ scores?

(b) Which one implies the largest sample size?

(c) Which one most strongly supports the conclusion that vitamin C decreases IQ

scores?

(d) Which one would most likely stimulate the investigator to conduct an additional

experiment using larger sample sizes?

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