Examine the sample data below.

a. Construct a stem-and-leaf plot to assess whether the data are from an approximately normal distribution.

b. Compute s for the sample data.

c. Find the values of QL and Q, and the value of s from part b to assess whether the data come from an approximately normal distribution.

d. Generate a normal probability plot for the data and use it to assess whether the data are approximately normal.

Applying the Concepts