To determine the sample size to complete a research study. What components would

Question

To determine the sample size to complete a research study. What components would the resasrcher have to specify a priori?   a. desired power, significance level and number of available subjects b. desired power, sampling frame and directionality of hypothesis    c. effect size, significance level and directionlity of hypothesis   d. desired power, estimated effect size and significance level

A study was not statistically significantl. The researcher conducted a post hoc power analysis and the power of the study was .60. Which of the following statements best interprets this post hoc power results: a. the risk of having committed a Type II error was about 40%   b. the risk of having committed a Type II error was about 60%   c. the sample was not representative of the target population   d. the risk of committing a Type 1 error was 40%

Explanation / Answer

1) The components that the resasrcher would have to specify a priori :

c. effect size, significance level and directionlity of hypothesis

2) The following statements best interprets this post hoc power results:

a. the risk of having committed a Type II error was about 40%

since Power = 1- P(Type II Error)

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