stats-confidence intervals

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stats-confidence intervals

  1. 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.

  1. Find the critical value

  2. Find the margin of error:  E =

  3. Find the confidence interval: CI =

  4. Write the conclusion.