Name ______

AP STATISTICS CHAPTER 5:

SAMPLING VOCABULARY

Give the definition of each:

  • Population
  • Census
  • Sample
  • Sampling Design
  • Simple Random Sample

Random Digits

Give an example of each

SAMPLING METHODS

Write the definition of each along with some pros and cons where applicable

  • Convenience
  • Voluntary Response
  • Stratified
  • Systematic
  • Cluster
  • Multistage

Give an example of each

Bias-

SOURCES OF BIAS

Give the definition of each:

  • Undercoverage
  • NonResponse
  • Response
  • Wording

Sampling Variability vs Sample Size

Give an example of each:

EXPERIMENTAL DESIGN

Define each term.

  • Observational Study
  • Experiment
  • Experimental Unit
  • Factor
  • Level
  • Response Variable
  • Treatment
  • Control Group
  • Placebo
  • Blinding
  • Double Blind

3 Principles of Experimental Design

Experimental Designs (Describe each)

  • Completely Randomized
  • Randomized Block
  • Matched Pairs

Confounding Variables

Draw the picture:

Draw the picture:

SUMMARY/QUESTIONS TO ASK IN CLASS

Name ______

AP STATISTICS CHAPTER 5:

  1. You’re in college now, and you want to investigate the attitudes of students at your school toward the faculty’s commitment to teaching. The Student Government will pay the costs of contacting about 500 students.

(a)Specify the population of interest for your study; for example, will you include part-time students?

(b)Describe your sample design. Will you use a stratified sample?

(c)Briefly discuss the practical difficulties that you anticipate; for example, how will you contact the students in your sample?

  1. In late 1995, a Gallup survey reported that Americans approved sending troops to Bosnia by 46 to 40 percent. The poll did not mention that 20,000 U.S. troops were committed to go. A CBS News poll,mentioned the 20,000 figure and got the opposite outcome -- a 58 to 33 percent disapproval rate. Briefly explain why the mention of the number of troops would cause such a big difference in the poll results. Write the name for the kind of bias that is at work here.
  1. Complete the definition: “The design of a study is biased if ...
  1. A corporation employs 2000 male and 500 female engineers. A stratified random sample of 200 male and 50 female engineers gives each engineer 1 chance in 10 to be chosen. This sample design gives every individual in the population the same chance to be chosen for the sample.

(a) Is it an SRS? Explain your answer.

“HOW POLLS ARE CONDUCTED” – Reflection questions

  1. What is the fundamental goal of a survey?
  1. In most surveys conducted by Gallup, how are subjects contacted to participate?
  1. What is bias?
  1. What is the typical sample size of a Gallup Poll?
  1. What is more important: the sample size of a poll, or the randomness in selecting subjects?

Steps in a simulation

  1. Identify the component to be repeated.
  1. Explain how you will model the outcome.
  1. Explain how you will simulate a trial. Don’t forget to discuss how repeats will be handled.
  1. State clearly what the response variable is. What are we interested in?
  1. Run several trials. Clearly record the outcome of each trial.
  1. Analyze the response variable.
  1. State your conclusion in the context of the problem.

SUMMARY/QUESTIONS TO ASK IN CLASS