Sample Size Determination and Power Analysis Using G*Power
A solved assignment explaining how to determine sample size and conduct power analysis using GPower.
Olivia Smith
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Sample Size Determination and Power Analysis Using G*Power
1. Calculate the sample size needed 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
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. Present an argument that your study is worth doing
with the smaller sample.
1. Calculate the sample size needed 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
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. Present an argument that your study is worth doing
with the smaller sample.
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Subject
Statistics