A certain drug was administered to 456 males, out of a total 720 in a certain locality, to
test its efficacy, to test its efficacy against typhoid. The incidence of thyroid is shown
below. Find out the effectiveness of the drug against the disease. (The table value of chi-
square for 1 d.f at 5% level of significance is 3.84).
Infection No infection Total
Administering the drug 144 312 456
Without administering the drug 192 72 264
Total 336 384 720
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guudi thoduga salla louda
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