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This assignment consists of three parts:

(1)  Sample Selection 

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Recommend the steps that should be taken to draw the particular sample described below.  Format your response as a procedure.

  1. A stratified sample of 75 doctors, 75 lawyers and 75 engineers who belong to a professional organization in that you belong to.
  2. A simple random sample of 150 subscribers to your local newspaper.
  3. A systematic sample of 250 subscribers from a subscriber list of a trade publication.

(2)  A Priori Power Analysis 

Download the G*Power software provided, and then use the software to submit the following:
a. Calculate the estimated sample size needed when given these factors:

  • one-tailed t-test with two independent groups of equal size
  • small effect size (see Piasta, S.B., & Justice, L.M., 2010)
  • alpha =.05
  • beta = .2 (Reminder: Power = 1 – beta)
  • Assume that the result is a sample size beyond what you can obtain. Use the compromise function to compute alpha and beta for a sample half the size.
    • Indicate the resulting alpha and beta.
    • Analyze the result and decide if the study should be conducted with a smaller sample size. Explain your rationale.
    • In the context of Type I and Type II error.
    • Include a visual of the G* Power output matrix.

b. Calculate the estimated sample size needed to perform an ANOVA (fixed effects, omnibus, one-way) when given these factors:

  • ANOVA (fixed effects, omnibus, one-way)
  • small effect size
  • alpha =.05

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