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, changing the standard deviation to 90?

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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, changing the standard deviation to 90?

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