Dear All,
I have a set of data that the mean change between the 2 groups is significantly different (p<0.05). But when I put calculate the power it gives only 50%. How should I interpret this?
Also, can someone kindly advise as whether it is meaningful (or pointless) to calculate the power when the result is statistically significant?
My data are as follows:
Group 1: mean change =0.3, s.d.=1.644, n=40
Group 2: mean change= -0.44, s.d.=1.409, n=41
t-test p-value = 0.03
power (around) 0.5
I will summarise the reponse. Many thanks in advance.
Regards.
Ly Mee
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