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Computing 90% confidence Interval from 95% confidence Interval alone

Computing from a large sample, one finds the 95% confidence interval for μ to be (6.8, 14.2). Based on this information alone, determine the 90% confidence interval for μ.

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Given, 95% confidence interval = ( 6.8 , 14.2 )

The sample mean ...

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The solution to the problem, finding 90% confidence interval, when 95% confidence limits are given is explained step by step with all the working so that student could use this solution to solve other similar problems.