If our random sample (10,000 people diagnosed with COVID-19) took hydroxychloroquine and most recovered in a couple of weeks and only 5% needed to be hospitalized, can we conclude that ...

Why with observation alone there is no random assignment of exposure, so confounding by other factors should always be considered as an explanation for associations found in an observational study.

Random assignment multicenter phase II study of modified docetaxel, cisplatin, fluorouracil (mDCF) versus DCF with growth factor support (GCSF) in metastatic gastroesophageal adenocarcinoma (GE).. JCO ...

If our random sample (10,000 people diagnosed with COVID-19) took hydroxychloroquine and most recovered in a couple of weeks and only 5% needed to be hospitalized, can we conclude that ...