A retailer wants to estimate the difference in mean spending per transaction between two independent groups of clientele: those that shop exclusively online and those that shop exclusively in the store, which have known standard deviations in their spending per transaction of $25 (online shoppers) and $30 (in-store shoppers). They take a random sample of 150 online shoppers, and calculate a mean spending per transaction of $225.0, and for a random sample of 200 in-store shoppers they calculate a mean spending per transaction of $266.0. What is the upper limit of the 96% confidence interval for the difference in mean spending per transaction between the two groups of shoppers (use the online shoppers as Population 1 and the in-store as Population 2). Note that if you believe the Welch Approximate t Procedure is appropriate, you can use the degrees of freedom of 344.1102. Enter your response to four decimal places in the space below