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One of your tree planting buddies has suggested that every person in Canada should be tested...

One of your tree planting buddies has suggested that every person in Canada should be tested for COVID-19 so we get a true, accurate, picture of who has the disease. I don't know the actual numbers but (in order to be as generous as possible) let's assume that the test is extremely accurate so that if you have COVID-19 it will show a positive result 99% of the time and if you don't have COVID-19 it will be positive only 2% of the time. Let's also assume that the prevalence of COVID-19 in the Canadian population at the time of testing is 1 in 1,000. If we had enough test kits to do such testing on the whole population of Canada, explain to your buddy how likely a person would be to have COVID-19 if he or she showed a positive test result.

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