Posted by Jill on Saturday, October 15, 2011 at 6:01pm.
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.

Research Methods  Jill, Saturday, October 15, 2011 at 6:02pm
Indicate which of the following sampling techniques are examples of random sampling. For those that are not examples of random sampling, explain why.

Research Methods  Ms. Sue, Saturday, October 15, 2011 at 6:04pm
What do you think?

Research Methods  Jill, Saturday, October 15, 2011 at 6:08pm
I think so, but once again.. the wording is confusing me..

Research Methods  Ms. Sue, Saturday, October 15, 2011 at 6:21pm
Didn't the students select themselves?

Research Methods  Jill, Saturday, October 15, 2011 at 6:24pm
well.. 35 students showed up.. but fifteen were only chosen.. which would then be a random sample? right..?

Research Methods  Ms. Sue, Saturday, October 15, 2011 at 6:27pm
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.
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