Sampling Design Overview. II. Sampling and Experimentation Planning and conducting a study (10%-15%) Data must be collected according to a well- developed.

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Presentation transcript:

Sampling Design Overview

II. Sampling and Experimentation Planning and conducting a study (10%-15%) Data must be collected according to a well- developed plan if valid information on a conjecture is to be obtained. This includes clarifying the question and deciding upon a method of data collection and analysis.

A.Overview of methods of data collection 1.Census 2.Sample survey 3.Experiment 4.Observational study II. Sampling and Experimentation

General questions 1. What is a census?

General questions 1.What is a census? A survey of every member of a population.

General questions 2. Why do we take samples?

General questions 2. Why do we take samples? A census is too difficult/too expensive. A sample can give us good information about the population much more cheaply and easily.

General questions 3. What is a sampling frame?

General questions 3. What is a sampling frame? The list of the population we use to generate a sample.

General questions 4. Why is randomization important?

General questions 4. Why is randomization important? To reduce sample selection bias.

General questions 5. What is bias?

General questions 4. What is bias? A description of a sampling method that tends to overestimate or underestimate the population parameter.

Source: 2007 AP Exam

Answer: E

B.Planning and conducting surveys 1.Characteristics of a well-designed and well- conducted survey 2.Populations, samples, and random selection 3.Sources of bias in sampling and surveys 4.Sampling methods, including simple random sampling, stratified random sampling, and cluster sampling II. Sampling and Experimentation

Answer: B

Source: 2007 AP Exam

Answer: E

Source: AP Course Description

Answer: E

Answer: C

Source: AP Practice Exam

Answer: C

Source: AP Practice Exam

Answer: E

D. Generalizability of results and types of conclusions that can be drawn from observational studies, experiments and surveys II. Sampling and Experimentation

Source: AP Practice Exam

Answer: B

Source: 2004 AP Exam Form B Discuss in groups.

Source: 2011 AP Exam Discuss in groups.

Source: 2011 AP Exam

Source: 2010 AP Exam Form B