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Exact(18)
This yielded a sample size of 6409 individuals, of whom 2451 were women.
An assumption of 5,000 users would have yielded a sample size of 319 runners.
Selecting cases with a valid value of W2C0 for working mothers yielded a sample size of approximately 3850.
This yielded a sample size of 136.1.
This yielded a sample size of 838.
This yielded a sample size of 16 participants per group.
Similar(42)
For our experiment with data from Iceland, preliminary analyses indicated that randomly deleting data would yield a sample size that was likely too small to effectively judge the quality of the matching procedures.
Based on these assumptions, the sample size was calculated as follows: This yields a sample size of 384.
Assuming a response rate of 40%, 1000 questionnaires would yield a sample size of 400 which would give a standard error of less than 2.5%.
We verified our results using conventional sample size calculations and the results are similar: conventional t-test based sample size calculations yield a sample size of 253 in each arm.
Anticipated attrition of 20% will yield a sample size of 90 participants, which will provide #62 80% power to detect a mean difference of 0.5%, with SD of 0.9%, using a one-sided 5% t-test, with 5% significance level.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com