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Suppose you are investigating if a new promotion will increase the sales of your store. You provided 13 people with the promotion, and also observed the sales amounts of 16 people who did not get the promotion. You found those who received the promotion to have an average monthly sales of $452.85, with a sample standard deviation of $53.86. You found those who did not receive the promotion had an average monthly sales of $370.42, with a sample standard deviation of $82.52. 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