Posted by **Prakash** on Thursday, October 6, 2011 at 2:08pm.

A 90% confidence interval for a population mean based on 144 observations is computed to be (2.7,3.4). How many observations must be made so that 90% confidence interval will specify the mean to within ± 0.2

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**cikdi**, Friday, October 7, 2011 at 10:43pm
n=140

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