I have been asked to present some information from a series of published articles according to Mean (+/- 95% Confidence Interval).
The statistical summaries are generally presented as:
Number of subjects (n)
Standard deviation of the mean (sd)
How do I calculate the 95% confidence intervals from just this information? Do I need the actual raw data??
Thanks, best wishes
To clarify; I am compiling a data chart summarizing a lot of very small studies (eg. n of 30).
eg. study A of 30 subjects found a mean of 20.2 with an sd of 6, study B of 42 subjects found a mean of 27 with an sd of 4, etc.
How do I find /calculate the t-quantile to place into the calculation?
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