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
(d) Which one would most likely stimulate the investigator to conduct an additional
experiment using larger sample sizes?
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