Conducting Surveys Investigation 2

1. Conducting SurveysInvestigation 2 Jackie, Kim, Deanna, Karen, and Tiffany

2. Objectives • To distinguish between a sample and a population • To consider various ways of developing a sampling plan • To use data from a sample to make predictions about a population • To design a survey, focusing on how questions are asked

3. Video Clip C:\Documents and Settings\tsclark\Desktop\video for amsti.asf

4. Can you roll your tongue? LET’S SEE! We would like for you to be a part of our class survey, take out your journal and record the number of people in your group. Then, record the number that can roll their tongue and the number of people that can not roll their tongue. What percent of your group can roll their tongue? Please record your answer in your journal.

5. Results Based on the information above, what is the percentage of the class that can roll their tongue?

6. Based on the percentage of the class that can, how can you predict the number of people that can roll their tongue of the attendees at this AMSTI Training? There are 250 people attending.

7. How Honest is America? • If you found someone else’s wallet on the street, would you: • Try to return it to the owner? • Return it, but keep the money? • Keep the wallet and the money? • If a cashier mistakenly gave you $10 extra in change, would you: • Tell the cashier about the error? • Say nothing and keep the cash? • Would you cheat on an exam if you were sure you wouldn’t get caught? • Yes b) No • If you found someone else’s telephone calling card, would you use it? • Yes b) No • Do you feel you are an honest person in most situations? • Yes b) No

8. Problem 2.1 • A sampling plan is a strategy for choosing a sample from a population. What is the sampling plan for this survey? • Suppose 5280 people answered the survey, and 4224 of them pressed 2 for question C. What percent of the callers said they would not cheat on the exam?

9. Problem 2.1 C. Of the 5280 callers, 1584 pressed 1 for question D. What percent of the callers said they would not use someone else’s calling card? D. The U.S. population is about 260 million. Based on the results of this survey, how many people in the United States would not cheat on an exam? How many would not use someone else’s calling card?

10. Problem 2.1 D. List some reasons why predictions about all Americans based on this survey might be inaccurate.

11. Investigation 2.2Selecting a Sample In the section, students discuss the advantages and disadvantages of different sampling plans. -Problem 2.2 shows several sampling plans in action.

12. Problem 2.2 • The follow-up explains the formal names of the sampling plans discussed in Problem 2.2. The plans discussed are convenience sampling, systematic sampling, voluntary-response sampling, and random sampling. • Students are asked to use critical thinking skills to discuss which sampling process would be best.

13. Investigation 2.3Asking the Right Questions -When conducting a survey, you must be careful how you ask your questions. • Open Questions: A person has to write a response. “What is your age?” • Closed Questions: It provides a set of choices. “What is your age?” Under 12 ___ 13___ 14____ Answers to closed questions are easier to organize and analyze.

14. Critiquing a Survey • Are the questions clearly stated? • Can any of the questions be misinterpreted? • Have I provided good, reasonable choices for the closed questions in my survey? • What types of answers can I expect to the open questions? • Will I be able to organize and analyze the data I collect?