Applying the Concepts 17. Response Rates Surveys tend to suffer from low respons

Question

Applying the Concepts 17. Response Rates Surveys tend to suffer from low response rates. Based on past experience, a researcher determines that the typical response rate for an e-mail survey is 40%. She wishes to obtain a sample of 300 respondents, so she e-mails the survey to 1500 randomly selected e-mail addresses. Assuming the response rate for her survey is 40%, will the respondents form an unbiased sample? Explain. 18. Delivery Format The General Social Survey asked, "About how often did you have sex in the past 12 months?" About 47% of respondents indicated they had sex at least once a week. In an internet survey for a marriage and family wellness center, respondents were asked,"How often do you and your partner have sex (on average)?" About 31% of respondents indicated they had sex with their partner at least once a week. Explain how the delivery method for such a question could result in biased responses 19. Order of the Questions Consider the following two questions (a) Suppose that a rape is committed in which the woman becomes pregnant. Do you think the criminal should or should not face additional charges if the woman becomes pregnant? 12. Assessment To help assess student learning in her developmental math courses, a mathematics professor at a community college implemented pre- and posttests for her students. A knowledge-gained score was obtained by taking the difference of the two test scores. (a) What type of experimental design is this? (b) What is the response variable in this experiment? (c) What is the treatment?

Explanation / Answer

a. Matched pair design

The professor collect the math scores pre and post-tests for the students. Here, the scores is matched pair as the same students are given pre- tests and post- tests. So, the experimental design is matched-pair design.

b. The response variable is how much knowledge was gained from the math course.

The responding variable is the part of an experiment that a scientists measures and observes closely for a change or a response. In a controlled experiment only one variable is changed on purpose; the manipulated or responding variable.

c. Giving two tests, the first prior to learning and the second post learning to see if the students were learning during the develepmental maths courses.

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