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Question 4 {1 point) J Saved 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. They take a random sample of 100 online shoppersI and calculate a mean spending of $250.0 and a standard deviation of $25. They then take a random sample of 150 in-store shoppers, and calculate a mean spending of $221.0 and a standard deviation of $30. What is the upper limit of the 94% 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 235.8800. Enter your response to four decimal places in the space below. Your Answer: 115 Your