the harder problem about this statistic

Given that there is an 20% incidence of diabetes in the population as a whole, and a 10% incidence of left handedness, we wish to test the hypothesis that lateral favoritism does not influence the frequency of diabetes. Enter in cells F2:F5 the theoretically predicted probability of L+, L-, etc., and in E8:E10 the P(L|+), P(L|-), and P(+|L).

Question

the harder problem about this statistic 

Given that there is an 20% incidence of diabetes in the population as a whole, and a 10% incidence of left handedness, we wish to test the hypothesis that lateral favoritism does not influence the frequency of diabetes. Enter in cells F2:F5 the theoretically predicted probability of L+, L-, etc., and in E8:E10 the P(L|+), P(L|-), and P(+|L).