# Statistical power/Data analysis tutorial

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## Power[edit | edit source]

- Power.xls
- If I am using a confidence interval of 95% and I want a power level .8, what would be the minimum sample size to detect a standardised mean difference of .3?
- If I am using a confidence interval of 99% and I want a power level of .7, what would be the minimum sample size to detect an effect size of .7?
- If I am using a confidence interval of 90% and I want a power level of .9, with a sample size of 200, what effect size will I be able to detect?
- If I am using a confidence interval of 95% and I will have a sample size of 50, and I want a power level of .8, what effect size will I be able to detect?