Question

Refrigerators Refer to Exercise $75$

a. Use your calculator to make a Normal probability plot of the data. Sketch this graph on your paper.

b. What does the graph in part $\left(a\right)$ imply about whether the distribution of refrigerator capacity is approximately Normal? Explain.

Short answer

Part (a) The graph is

Part (b) Yes.

Step-by-step solution

Part (a) Step 1: Given information

The data set is:

12.9	13.7	14.1	14.2	14.5	14.5	14.6	14.7	15.1	15.2
15.3	15.3	15.3	15.3	15.5	15.6	15.6	15.8	16	16
16.2	16.2	16.3	16.4	16.5	16.6	16.6	16.6	17	17
17.2	17.4	17.4	17.9	18.4

Part (a) Step 2: Explanation

The normal probabilities plot can be constructed as

Part (b) Step 1: Explanation

All of the points in the above plot are within the boundary, implying that the distribution is essentially normally approximated. As a result, the data can be said to have been collected from a regularly distributed population.