Suppose that your task is to estimate the mean of a normally distributed population to within 10 units with 95% confidence and that the population standard deviation is known to be 70.
What sample size should you use with a 90% confidence level?

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The Answer of Suppose that your task is to estimate the mean of a normally distributed population to within 10 units with 95% confidence and that the population standard deviation is known to be 70.
What sample size should you use with a 90% confidence level?

Suppose That Your Task Is to Estimate the Mean of a Normally