Lesson 3: Characteristics of Good Sample Surveys and Comparative Studies

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Assignments

  • Complete the 'Poll Monday' and 'Thinking Tuesday' Activities for Lesson 3.
  • Read Chapter 4 in the text
  • Read the "How are Polls Conducted" essay by the Gallup organization (in Canvas)
  • Read Chapter 5 in the text
  • Work through the Lesson 3 online notes that follow.
  • Complete the Practice Questions 
  • Complete the Lesson 3 Assignment last

Learning Objectives

Chapters 4 & 5

After successfully completing this lesson, you should be able to:

  • Distinguish between a population, sample, and sampling frame.
  • Interpret and identify the factors that affect the margin of error.
  • Identify types of probability samples and judgment samples.
  • Apply the "Difficulties and Disasters" in sampling to real world problems.
  • Identify all steps used and issues addressed by the Gallup Poll.
  • Distinguish between randomized experiments and observational studies. 
  • Distinguish between two independent and two dependent (matched paired) samples. 
  • Apply basic terms associated with research studies.

Terms to Know

click on the terms to learn more

Chapter 4

  • sample surveys
  • experiments
  • observational studies
  • unit (sampling unit)
  • population
  • sample
  • sampling frame
  • census
  • margin of error (ME)
  • sample size (n)
  • probability sampling
  • simple random sample
  • stratified sampling
  • cluster sampling
  • systematic sampling
  • voluntary sample
  • convenience sample
  • haphazard sampling
  • nonresponse bias
  • response rate
  • random-digit dialing
  • selection bias
  • sample percent
  • population percent

From Chapter 5

  • experimental unit
  • explanatory variable
  • treatment
  • response (outcome) variable
  • confounding variable
  • randomized experiments
  • independent samples
  • dependent samples
  • matched pair design
  • block design
  • carryover effect
  • placebo (placebo effect)
  • case-control study
  • retrospective study
  • prospective study
  • single blind
  • double blind