# In a class of 25 students the average grade on a quiz is 16.85, with a standard

## Question:

In a class of 25 students the average grade on a quiz is 16.85, with a standard deviation is 4.75. The grades are known to be normally distributed.

a. Determine the standard error of the mean.

b. Determine the 98% confidence interval for the class grades.

c. If you wanted a narrower interval, would you increase or decrease the confidence level?

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**Related Book For**

## Basic Statistics For Business & Economics

**ISBN:** 9781259268939

6th Canadian Edition

**Authors:** Douglas A. Lind, William G Marchal, Samuel A. Wathen, Carol Ann Waite