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...social aspects of testing. It is much easier for people to provide their own nasal swabs or a saliva sample to test, but such samples are more likely subject to variability and saliva samples generally have less virus to test. This means that higher sensitivity is needed. You can see that there is a trade-off between speed, accuracy and convenience in the different tests....

...working out where the risks lay when making assumptions about them if they are ambiguously or poorly reported. The questions that statistics asks At its heart, statistics is concerned with asking the following questions: is this thing the same as another thing, given things vary? Or: is this thing or these things behaving in a particular way, given things vary? Or: how...