3. A certain drug was administered to 500 people out of a total of 800 included in a sample to test its efficiency against Typhoid, the result are given below : Typhoid No Typhoid 200 300 20 320 Total 500 300 800 Drug No Drug Total On the basis of data, can we say that drug is effective in preventing Typhoid? 280 480

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A: Thanks for the question :)And your upvote will be really appreciable ;)

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