Question: What sample size is needed to obtain a 99% confidence interval of length 2.0 for the mean of a normal population with variance 25? Use

What sample size is needed to obtain a 99% confidence interval of length 2.0 for the mean of a normal population with variance 25? Use Fig. 526. Check by calculation.

0.6 -y = 99% 0.4 Y = 95% 0.2 500

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n 166 The ordinate in Fig 526 is L 25 04 and the figure gives ... View full answer

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