The problem is to calculate the sample size needed to show that the intervention (that my sample and the previous study received) will result in an outcome score of 83.5 or more. I want to use the same method described in the attached paper.
Null hypothesis: Mean = 83.5 (PASS value equivalent from example)
Alternative hypothesis: Mean >(greater than or equals) 83.5
Data from previous studies: n=16, mean = 86.1, SD=12.6
(Data from my sample: n=19, mean=89.7, SD=5.8)
Is it possible to calculate a sample size with this information?
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