consuming and convenient, but it also solves the problem of not being able to make anyone to partake in the experiment against their will. I was able to carry this out by making an announcement asking for volunteers. Using this method, I was able to reach the entire student body and get a hold of those that were willing to participate. Although using the voluntary response sample gave everyone an equal chance to participate, there was still room for bias. Firstly, non-response bias may have occurred. People who had more free time during that day or that were more outgoing were more likely to volunteer. Likewise, if I would have given an incentive to be able to get more volunteers, such as giving volunteer hours, people who need more volunteer hours would be more likely to volunteer. Although free time, being outgoing, and a need for volunteer hours are not directly correlated to basketball skills, a possible connection may be present. Also, since the experiment was conducted only once at a particular time, only people who were available at that time would have been able to participate. If there was a particular club that was going on during that time, such as a soccer team practice, then soccer player’s numbers would not be included in the data and it would be slightly biased. Although it was important to try and minimize the above mentioned bias possibilities, it was difficult given the conditions of the experiment. In my announcement, I made it clear that the experiment was open to both boys and girls and that equal amounts of each were needed, to avoid gender bias. I also asked people from each grade to come and participate to try and get an even spread of ages. Although I was not able to book the gym for more than that day because of technical issues, having more than one day of the activity would have helped to minimize bias.
- Fall '12
- Voluntary Response Sample