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Wrap it up, chapter 10 Practice with sampling methods and biases.

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Presentation on theme: "Wrap it up, chapter 10 Practice with sampling methods and biases."— Presentation transcript:

1 Wrap it up, chapter 10 Practice with sampling methods and biases.

2 Describe two ways this question may lead to response bias. Many people believe this playground is too small and in need of repair Do you think the playground should be repaired and expanded even if that means raising the entrance fee to the park?

3 You are writing a survey to find out if the students at KHS would be willing to walk across the street to buy regular soda. Write a question that is biased towards them answering yes to walking across the street to buy a regular soda Page 1.2 Share out

4 In a large city school system with 20 elementary schools, the school board is considering the adoption of a new policy that would require elementary students to pass a test in order to be promoted to the next grade. The PTA wants to find out whether parents agree with this plan. For each, indicate what kind of sampling strategy is involved and what (if any) biases might result. Put a big ad in the newspaper asking people to log their opinions on the PTA website. Sampling Strategy: Biases: 1.3 & 1.4

5 In a large city school system with 20 elementary schools, the school board is considering the adoption of a new policy that would require elementary students to pass a test in order to be promoted to the next grade. The PTA wants to find out whether parents agree with this plan. For each, indicate what kind of sampling strategy is involved and what (if any) biases might result. Randomly select one of the elementary schools and contact every parent by phone. Sampling Strategy: Biases: 1.5 & 1.6

6 In a large city school system with 20 elementary schools, the school board is considering the adoption of a new policy that would require elementary students to pass a test in order to be promoted to the next grade. The PTA wants to find out whether parents agree with this plan. For each, indicate what kind of sampling strategy is involved and what (if any) biases might result. Send a survey home with every student, and ask parents to fill it out and return it the next day. Sampling Strategy: Biases: 1.7 & 1.8

7 In a large city school system with 20 elementary schools, the school board is considering the adoption of a new policy that would require elementary students to pass a test in order to be promoted to the next grade. The PTA wants to find out whether parents agree with this plan. For each, indicate what kind of sampling strategy is involved and what (if any) biases might result. Randomly select 20 parents from each elementary school. Send them a survey, and follow up with a phone call if they do not return the survey within a week. Sampling Strategy: Biases: 1.9 & 1.10

8 Do you think the proposed sampling method is appropriate? Explain. 3a) We want to know what percentages of local doctors accept Medicaid patients. We call the offices of 50 doctors randomly selected from local Yellow Pages listings

9 Do you think the proposed sampling method is appropriate? Explain. 3b) We want to know what percentage of local businesses anticipate hiring additional employees in the upcoming month. We randomly select a page in the Yellow Pages and call every business listed there.


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