I cannot figure out how to get the 95% confidence interval for this problem.

Problem Value: 10 point(s). Problem Score: 80%. Attempts Remaining: 1 attempt. (10 points) A recent study of two vendors of desktop personal computers reported that out of 890 units sold by Brand A, 149 required repair, while out of 787 units sold by Brand B, 100 required repair. Round all numeric answers to 4 decimal places. 1. Calculate the difference in the sample proportion for the two brands of computers, P BrandA - P BrandB = .0404 2. What are the correct hypotheses for conducting a hypothesis test to determine whether the proportion of computers needing repairs is different for the two brands. OA. Ho : PA - PB = 0, HA : PA - PB > 0 OB. Ho : PA - PB = 0, HA : PA - PB # 0 OC. Ho : PA - PB = 0, HA : PA - PB