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A Gallup researcher claims that the proportion of US adults that have tried marijuana has increased...

A Gallup researcher claims that the proportion of US adults that have tried marijuana has increased over the past three years. in a 2013 of 2027 US adults 770 responded that thye had tried marijuana. in a recent survey 1023 US adults 440 responded that they had tried marijuana. test the researchers claim at a significance level at a=0.10

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