The body mass index (BMI) of individual is one measure that is employed to judge whether an individual is overweight or not. A BMI between 20 and 25 points out that one is at a normal weight. In survey of 750 men and 750 women, the Gallup organization found that 203 men and 270 women were normal weight. Develop a 96% confidence interval to gauge whether there is difference in the proportion of men and women who are normal weight.