Chapter 2.1, Problem 39E

To determine

Discuss the travel time distribution according to dotplot data.

Explanation of Solution

Given information:

  

Shape:

In the dotplot, we can see that most of the dots lie to the left along with a tail of more unusual dots to the right. Thus, the distribution is skewed to the right.

Center:

The highest numbers of dots are present between 10 and 15. Thus, the peak of the distribution seems to lie between 10 and 15. Then the middle value is estimated as the center of the distribution and the middle value between both the values is 12.5.

Unusual features:

The largest gap seems to lie between 60 and 80. Due to the large gaps in the dotplot, there seems to be a few outliers.

Spread:

In the dotplot, the leftmost dot seems to lie at 0, whereas the rightmost dot seems to lie at 90. Thus, this depicts the range of data values from 0 and 90.