4 ms·
Look up "efficacy" it has a specific medical meaning. Those tests are not about efficacy. Scientific method require each person be equally exposed to the virus
by RobertRoberts 6y ago
Look up "efficacy" it has a specific medical meaning. Those tests are not about efficacy.
Scientific method require each person be equally exposed to the virus under strict lab conditions.
- viraptor 6y agoScientific method uses statistics and can make reasonable assumption that for large enough randomised groups the collective exposure is the same without strict lab conditions. From the group size and number of infections, you can calculate the confidence of the result you find. Keep in mind that even under strict lab conditions your results would never be 100% certain.