Question 8 (1 point) You are a sales manager for a grocery store, and you want to see if the introduction of a new sales promotion will increase the sales in your store. To do so, you decided to create an experiment by giving a small sample of customers the promotion before expanding it to a larger customer base. You gave 24 people the promotion, and also observed the sales of 24 people who did not get the promotion as a control group. You found those who received the promotion to have an average monthly sales of $469.86, with a sample standard deviation of $47.15. You found those who did not receive the promotion had an average monthly sales of $391.67, with a sample standard deviation of $75.46. Suppose you want to create a confidence interval for promotion no promotion What is the standard error of the difference between sample averages in your analysis? Note: 1- Only round your final answer. Round your final answer to two decimal places. Your Answer: