Double Hump Normal Distribution
Figure 13.5 Negative Exponential Distribution
below. To understand when this distribution would be used, consider the first time you visit a
Web page that has a large amount of text. On that first visit, you will probably want to read the
text, but the next time you might simply click through that page on the way to a page located
deeper in the site. This is precisely the type of user behavior this distribution represents. The
figure below shows that 60 percent of the users who view this page spend about 8 seconds on the
page scanning for the next link to click, and the other 40 percent of the users actually read the
entire page, which takes about 45 seconds. You can see that both humps are normal distributions
with different minimum, maximum, and standard deviation values.