Surveys

1. Surveys • Are a way to gather data. • Can be used to gather facts or opinions from people. • In order for the survey to be valid, each participant must be asked the samequestions.

2. Writing Survey Questions • When a question leads participants toward or away from a certain answer, it is a biased question. Valid surveys are unbiased! • Re-write this biased question so that it is unbiased. • Should all students be forced to take PE?

3. Sampling • In a survey, the people you interview are called your sample. • When giving a survey, valid results depend on asking unbiased questions and polling a representative sample. • Representative sample: random mix of population involved in your survey

4. Tell whether each group makes a representative sample. You are conducting a survey to see if we should hold a talent show or softball game as a fundraiser for the BJHS library. A) Members of the girls’ softball team B) Members of the school band C) Every 5th student in line at lunch D)Every student who picks up a survey and completes it from a table display.

5. Determine if the sample taken is representative of the population without bias shown. 1. ABC Family is a television channel that targets families and young adults to view their station. ABC Family regularly posts online poll questions to their website. In 2010, ABC Family polled their viewers to ask about airing Rated “R” movies after 8pm on their channel. Almost 200,000 people responded, and 85% of them disagreed with airing Rated “R” movies.

6. Determine if the sample taken is representative of the population without bias shown. 2. Mrs. Jones wants to know how the 5th grade feels about recess time. Mrs. Jones labels every student in the 5th grade with a number. She then draws 50 numbers out of a hat and surveys these students. Mrs. Jones determines that 5th graders would like more recess time than they currently have.