Chapter 12 - Data Analysis and Probability - 12-5 Samples and Surveys - Practice and Problem-Solving Exercises - Page 757: 23

The answer is below.

Here, it is important to note that the data sets are actually relatively close to each other. Given a relatively small sample size, one would expect some variation in the results. Thus, while the data set is random, it may lead to poor results by being too small.