A certain brokerage house wants to estimate the mean daily return on a certain stock. A random sample of 12 days yields the following return percentages: 2.08, -2.59, 1.13, 2.88, -0.74, -1.19, 0.28, 1.41, 2.53, -2.85, -2.41, -0.68 If we assume that the returns are normally distributed, find a 95% confidence interval for the mean daily return on this stock. Need to find the lower and upper confidence interval? I really need to know the formula to get the MEAN....the rest I can figure out. Please show your work. Will definitely give a tip for the correct solution!!