Final answer:
A box plot is a graphical representation of the five-number summary of a dataset. The shape of a box plot indicates the distribution of the data. To compare the foreign travel of Americans and Germans, you can examine the upper whiskers. By comparing the median, box width, and whisker lengths of the box plots, you can determine which country's 20-year-old residents have traveled more.
Step-by-step explanation:
Figure 2.45 shows a box plot, which is a graphical representation of the five-number summary of a dataset. The shape of each box plot can provide information about the distribution of the data. A box plot with a relatively narrow box and short whiskers indicates a dataset with a small range and low variability. On the other hand, a box plot with a wide box and long whiskers suggests a dataset with a larger range and higher variability.
To determine whether more Americans or more Germans surveyed have been to more than eight foreign countries, you would need to compare the respective box plots for Americans and Germans. Specifically, you would look at the upper whisker of each box plot, which represents the maximum value. If the upper whisker of the American box plot is higher than the upper whisker of the German box plot, it would imply that more Americans have been to more than eight foreign countries.
To compare the three box plots and understand the foreign travel of 20-year-old residents from the three countries, you would look at the median, the box width, and the whisker lengths. A higher median, wider box, and longer whiskers would suggest a greater number of foreign travels. By comparing these features, you can assess which country's 20-year-old residents have traveled more.