#3. A study was conducted in which fish populations in two ponds, A and B, were compared. Weight was measured. 45 fish were measured for their weight in pond A and 55 fish were measured for their weight in pond B. The average weight was 4.5 1b for pond A and 4.2 1b for pond B. It is also known that the population standard deviations are 0.6 lb and 0.4 lb for ponds A and B, respectively. (a). What is the distribution for X4 YB (b). Find a two-sided 95% confidence interval of HB - HA