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A hospital emergency room has collected a sample of n = 55 to estimate the mean number of visits per day. It has found the standard deviation is 15. Using a 95 percent confidence level, what is its margin of error?

Respuesta :

Answer:

Step-by-step explanation:

Using this table, the critical value for the 90% confidence level is 1.645 (note: look in the row that starts with infinity and look for the value above 90%)

So z = 1.645

Given Information:

n = 40

s = 32

A hospital emergency room has collected a sample of n = 40 to estimate the mean number of visits per day. It has found the standard deviation is 32. Using a 90 percent confidence level, what is its margin of error?

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sample mean:: x-bar = 40

ME = 1.645(32/sqrt(40)) = 8.32

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