How does sample size affect the validity of a study

RES 710 University of Phoenix Sample Size Estimation Discussion Paper

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Mathematics

RES 710

University of Phoenix

RES

Question Description

 

 

Part 1.

Frankfort-Nachmias and Leon-Guerrero (2018) noted that the precision of a confidence interval can be enhanced by increasing the sample size.

Write a 250- to 300-word response to the following:

  • How does sample size affect the validity of a study?
  • What factors determine the size of an ideal sample?
  • How is the sample size calculated?

Reference: Frankfort-Nachmias, C., & Leon-Guerrero, A. (2018). Social statistics for a diverse society (8th ed.). Thousand Oaks, CA: SAGE Publications, Inc.

Part 2

Respond in 150 words or more

Sometimes students will choose a population that is so large the sample would also be large. I call it looking at an entire forest instead of looking at a single tree. What do you think a researcher could do to decrease the population size?

PART 3

Write a 250- to 300-word response to the following:

  • Select one of the sampling designs introduced in this week’s readings.
  • Give a brief introduction of the sampling design, and explain where you might apply it most successfully.

PART 4

Respond in 150 words or more

I agree that probability sampling is a good way to go. Can you think of research or a project it would work in?