Comment 67582

By math geek (anonymous) | Posted August 06, 2011 at 23:28:35 in reply to Comment 67536

misterque said"A survey of less than 2000 doctors in a country that has more than 100000 is hardly a study, a consensus or a reason to take off one's helmet."

Actually that's a pretty good study. The story said 2/3 (66.6%) of the 1427 surveyed doctors opposed the helmet law, so knowing that, and assuming the doctors questioned were chosen at random from the list of all doctors we can do the statistical calculations and find a confidence interval of 3.02 with a confidence level of 99%

What that means is if you were to survey all 100000 doctors in the country you could be 99% sure that between 63% and 69% of them would oppose the use of helmets.

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