7. We know through the tremendous amounts of data that we collect on our company website that the average length of time per website visit for all of our website users is 12.45 minutes. This is a heavily right-skew distribution with most of the visits being only a couple of minutes, but some of them lasting several minutes or even hours.

12.45 minutes is a

1. parameter
2. statistic
3. proportion
4. standard error
5. all of the above
6. none of the above