Question

9) In a randomized controlled trial in Kenya, insecticide treated bed nets were tested as a way to reduce malaria. Among 343 infants using bed nets, 15 developed malaria. Among 294 infants not using bed nets, 27 developed malaria (based on data from “Sustainability of Reductions in Malaria Transmission and Infant Mortality in Western Kenya with use of insecticide treated bed nets, Journal of the American Medical Association, Vol. 291, No. 21) a) Construct a 99% confidence interval for the difference in proportions between the two populations. You decide which population is population 1 and which is population 2 b) Based on your results do bed nets appear to be effective?

Answer 1

from above 99% confidence interval for the difference in proportions between the two populations =-0.089 ; 0.029

b)as interval contains 0 ; therefore we can not conclude that bed nets appear to be effective