TCC Evaluate Sampling Method and Sample Size Discussion – Description
(1) Sample Selection
Recommend the steps that should be taken to draw the particular sample described below. Format your response as a procedure.
A stratified sample of 75 doctors, 75 lawyers and 75 engineers who belong to a professional organization in that you belong to.
A simple random sample of 150 subscribers to your local newspaper.
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 sizesmall effect size (see Piasta, S.B., & Justice, L.M., 2010)alpha =.05beta = .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 sizealpha =.05beta = .23 groupsInclude a visual of the G* Power output matrix.
https://www.psychologie.hhu.de/arbeitsgruppen/allgemeine-psychologie-und-arbeitspsychologie/gpower.html
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