6 ms·
> I'm not sure how 21% lower is considered "not statistically significant", in trying to suppress the spread, ANYTHING > 0% is helpful. Full stop. Statistical
by traek 5y ago
> I'm not sure how 21% lower is considered "not statistically significant", in trying to suppress the spread, ANYTHING > 0% is helpful. Full stop.
Statistical significance has a specific meaning in the context of hypothesis testing. It is a measure of likelihood that the observed result occurred due to a real difference between groups (rather than random chance).
- deleted 5y ago[deleted]
- eliasmacpherson 5y agoIt seems that they are adding up the margin of errors for 82/1461 and 87/1461, (schools responded divided by schools surveyed), giving a total margin of error of ~20% for these optional vs. mandatory masked student statistics. This is a problem with using surveys with a low response rate. In their own words in that section, by the incident rate ratio it is statistically significant, even after having been adjusted for county level 7 day incidence. You can try and figure it out on page 4 of the cdc report, it does not appear to be a null hypothesis test. https://www.cdc.gov/mmwr/volumes/70/wr/pdfs/mm7021e1-H.pdf https://www.cdc.gov/mmwr/volumes/70/wr/pdfs/mm7021e1-H.pdf