# stats-confidence intervals

**Question description**

Confidence Interval – Mean

A random sample of 48 days taken at a large hospital shows that an average of 38 patients were treated in the emergency room per day. The standard deviation of the population is 4. Find the 99% confidence interval of the mean number of ER patients treated each day at the hospital.

Find the critical value

- Find the margin of error: E =
- Find the confidence interval: CI =
- Write the conclusion.

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