Wanting help with dissertation - performing meta analysis as part of my medical degree - hope I am posting on correct line.
Need to work out Standard deviation from confidence interval for both placebo and treatment group think the equation is:
SD = SQRT of N x (upper limit - lower limit)/3.92.
CI = 95%
Is this correct?
Treatment group: Number = 52 - upper limit 55 - lower limit 24.3
Control group: Number 57 - upper limit 28.1 - lower limit 13.7
So are the answers: Treatment = 56
Control = 28
Any help would be great