Research Methods
posted by Jill on .
A researcher wants to attain a random sample of young drivers who have received DUIs within the last year. Using the PREP system, he asks all first year students at WLU who have received a DUI to volunteer for the study. Thirtyfive students actually admit to having received DUIs. He assigns a number to each of these students and chooses 15 participants using a table of random numbers.

Indicate which of the following sampling techniques are examples of random sampling. For those that are not examples of random sampling, explain why.

What do you think?

I think so, but once again.. the wording is confusing me..

Didn't the students select themselves?

well.. 35 students showed up.. but fifteen were only chosen.. which would then be a random sample? right..?

Only 35 admitted to having a DUI. It's likely that many more had DUI's but didn't admit it.
Your sample is skewed.