Answer
It is lower because people who spend more time with NPR are more likely to respond, and thus, sample will contain more people who spent time with NPR than usual, which causes the sample proportion to be overestimated.
Work Step by Step
It is lower because people who spend more time with NPR are more likely to respond, and thus, sample will contain more people who spent time with NPR than usual, which causes the sample proportion to be overestimated.
