Sickle-cell trait is a hereditary condition that is common among blacks and can cause medical problems. Some biologists suggest that it may also protect against malaria. That might explain why it is found in people originating in Africa where malaria is common. A study in Africa tested 543 children for the sickle-cell trait and also for malaria. In all, 188 of them had malaria infections. Of the 136 children with sickle-cell trait, only 36 of them had malaria infections. The other 407 children lacked the sickle-cell trait, and 152 of them had malaria infections. For the sample of 543 children studied, 136 had the Sickle-Cell trait. Construct a ONE-sample 95% confidence interval to estimate the proportion of all African children who have Sickle-Cell trait. Select one: O a. 0.25 + 0.073 O b. No other choice is correct. O c. 0.25 + 0.036 O d. 0.21 + 0.036 Time left 1:20:50 e. 0.21 + 0.073