1 The Popular Disinfectant Listerine Is Named After Joseph Lister A British Physician Who Pioneered The Use Of Antise 1 (74.96 KiB) Viewed 27 times
1. The popular disinfectant Listerine is named after Joseph Lister, a British physician, who pioneered the use of antiseptics. Lister conjectured that human infections might have an organic origin and thus could be prevented by using a disinfectant. Over a period of severalyears, he performed 75 amputations: 40 using carbolic acid as a disinfectant and 35 withoutany disinfectant. The following results were obtained Patient Survived Patient Died Total With carbolic acid 34 6 40 Without carbolic acid 19 16 35 a. Are the survival significantly different between the two groups. Test using a= 0.05. State each step clearly. Use the critical value approach.
b. Construct a 90% confidence interval between the survival rates for the two groups. Interpret the answer. 1-«= α= a/2= Z«/2 = A 90% confidence interval for P1 – P2 is: ((Ⓡ1 – P2) – Z«/2/ = P1(1-21) P2(1-P2) + ni n2 Interpret the interval:
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