Question

Year 13 Statistics students were given an assignment where they had to design and conduct a survey about an issue of their choice and find out how all the students at their school felt about this issue. Evelyn decided to investigate how students were feeling about the change her school went through. That is, the school changed from individual classroom teaching to open plan teaching. She stood outside one of the four school gates and gave a survey form to every 10th person that walked past. In total 125 surveys were given out and there were 41 responses. One of the questions she asked was "Do you think that open plan teaching is stupid?" Which one of the following statements is false? There is likely to be question effect bias for this question because of its wording. A confidence interval for the proportion of students at Evelyn's school who think open-plan teaching is stupid is constructed. This interval will account for some of the non-sampling error for this question. There is non-response bias because only 41 out of 125 surveys were completed. Selection bias is one of the potential errors for this survey. There is no concern with self-selection in this survey.

Answer 1

Your results would be severely affected by self selection bias because only those who received the survey question would be likely to respond.

Survey was given to every 10 th person walked past. So self selection prevails here.

The last option is correct.