Stats 110A Quiz 2 Oct. 22, 1999

NAME:

Below is a boxplot of the number of hours this class reported watching TV the night before the Fall quarter began. It is broken into two groups by sex.

1. (4 pts) Sketch one possible histogram for the male's TV variable.

 Features your sketch should have: About 1/4 of the total area should be between 0 and 1, and another 1/4 between 1 and 2. The rest is spread out in the range from 2 to 6. Here's what the actual histogram looks like:

2. (2) What's the minimum number of hours of TV for the males? 0

Twenty-five percent of the males watched less than how many hours? 0

3. (4) Who would you say watched more TV: males or females? Why?

This is a very ambiguous question. Part of the point of asking you such a question is to help you see how difficult it can be to answer questions that, on their face, seem straightforward. So there are several correct answers, and what we're looking for is evidence that you're reasoning correctly. Here are some possible answers:

a) Females watch more TV, because the median amount watched by Females is higher than that watched by Males. So 50% of all Females in the sample watched more TV than 50% of all Males.

b) Males watch more. Roughly 12.5% of the Males watched more TV than the female with the greatest amount of TV.