Researchers in the corporate office of an airline wonder if there is a significant difference between the cost of a flight on Priceline.com vs. the cost of the same flight on the airline's own website. A random sample of 8 flights were tracked on Priceline.com and the airline's website and the mean difference in price (Priceline.com - Airline Site) was $-60.632 with a standard deviation of $14.1786. Create a 95% confidence interval for the true average difference in costs between the vendors. 1) (-62.9966, -58.2674) ( 2) (72.4856, -48.7784) 3) (-72.1917, -49.0723) ( 4) (-65.6449, -55.6191) ( 5) (-72.4856, -48.7784)