A group of African children were tested for both sickle-cell and malaria. Out of the whole...

A group of African children were tested for both sickle-cell and malaria. Out of the whole group, 23% had sickle-cell, 35% had malaria, and 6% had both. (a) Use a contingency table to structure the above information about the incidence of sicklecell and malaria among these children. Complete all marginal totals as well as the body of the table. [4] (b) What proportion of children with malaria also had sickle-cell? [2] (c) Among children who had sickle-cell, what proportion did not have malaria? (d) Among the children tested, is having malaria statistically independent of having sickle-cell?

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