Consider the following results for independent samples taken from two populations. Sample 1 Sample 2 21 = 400 743 = 200 P1 = 0.49 Pa = 0.39 a. What is the point estimate of the difference between the two population proportions (to 2 decimals)? b. Develop a 90% confidence interval for the difference between the two population proportions (to 4 decimals). Round your critical value to 3 decimal places. to c. Develop a 96% confidence interval for the difference between the two population proportions (to 4 decimals). Round your critical value to 3 decimal places. to