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It could be that my memory of hypothesis testing is outdated, but being 1 standard deviation away from the mean isn't evidence of a significant difference in sk
by crazynick4 8y ago
It could be that my memory of hypothesis testing is outdated, but being 1 standard deviation away from the mean isn't evidence of a significant difference in skills.
- rwj 8y agoExcept that this isn't hypothesis testing. The graphs are not clearly labelled, but I'm interpreting the results as indicating that the entire population is shifted. This would be a significant advantage. (If it was hypothesis testing, 1 sigma could be statistically significant depending on sample size. You might be confusing the population variance with the sample mean variance.)
- crazynick4 8y ago> You might be confusing the population variance with the sample mean variance. That's exactly what I'm doing - thanks for pointing that out.
- hopler 8y agoYou are likely conflating sample mean with p values. 1 standard deviation in mean is substantial. That means approximately that 80% of one group exceeds performance of the median of the other group.