As sample size goes up, what tends to happen to 95% confidence
intervals?
(i) They become more precise (ii) They become narrower
(iii) They become wider
(iv) Both (i) and (ii)
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Increasing the sample size decreases the width of confidence intervals, because it decreases the standard error. c) The statement, "the 95% confidence interval for the population mean is (350, 400)", is equivalent to the statement, "there is a 95% probability that the population mean is between 350 and 400".
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