An experimenter would like to construct a 99% confidence interval with a width at most 0.5 for the average resistance of a segment of copper cable of a certain length. If the experimenter knows that the standard deviation of such resistances is 1.55 . How big a sample should the experimenter take from the population? What happens if the standard d

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An experimenter would like to construct a 99% confidence interval with a width at most 0.5 for the average resistance of a segment of copper cable of a certain length. If the experimenter knows that the standard deviation of such resistances is 1.55 . How big a sample should the experimenter take from the population? What happens if the standard deviation and the width of the confidence interval are both doubled?

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