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    First experience posting - not so good.

    Folks, I posted this. If a moderator has time I would appreciate them going through the thread and seeing whether I have some cause to feel that I am not getting the best 'poster' experience. Given this is my first...
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    Representative sample - how to decide

    I am interested in understanding some of the Covid 19 statistics being thrown around. What I want to know is how to figure out whether a sample that was used to generate probabilities was actually representative of the population that was supposed to be sampled. I want to do this 'backwards' so...