Pre: Respiratory rate 64.1 +/- 18.3
Post: RR 56.6 +/- 10.7
Difference: 7.5
Sample size is required for One group, Quasi experimental design.
Muhammad Adnan
@Rainer Duesing, power 80%, alpha 5%, two sided. Please also tell how do I calculate myself. Thank you.
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Rainer Duesing
The easiest way is to use a free program like G*Power (Faul, Erdfelder & Lang), but it is a bit of a black box, so you should seek for other sources to know what is going on.
For your estimated effectsize of d=0.47 you get an estimated sample size of N=38 for a repeated measures t-test. For d=0.5 it is N=34 and d=0.4 N=52
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