The chapter preview example introduced data from a survey of new car owners conducted by the J. D. Power and Associates marketing firm (USA Today, June 16 and July 17, 2010). For each brand of car sold in the United States, data on a quality rating (number of defects per 100 vehicles) and a customer satisfaction rating (called the APEAL rating) are given in the accompanying table. The APEAL rating is a score between 0 and 1000, with higher values indicating greater satisfaction. In this exercise, you will use graphical displays of these data to answer the questions posed in the preview example.

a. Construct a dotplot of the quality rating data.
b. Based on the dotplot, what is a typical value for quality rating?
c. Is there a lot of variability in the quality rating for the dif-ferent brands? What aspect of the dotplot supports your answer?
d. Are some brands much better or much worse than most in terms of quality rating? Write a few sentences com-menting on the brands that appear to be different from most.
e. Construct a histogram of the APEAL ratings and com-ment on center, spread, and shape of the data distribution.
f. Construct a scatterplot of x = quality rating and y = APEAL rating. Does customer satisfaction ( as measured by the APEAL rating) appear to be related to car quality? Explain.

Transcribed Image Text:

Quality Rating APEAL Rating Chevrolet Chrysler 122 130 126 102 Quality Rating APEAL Rating 130 6 170 106 2 1 146 2 122 Volkswagen 3