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QUESTION 12 A sales manager for an automobile parts retail store wanted to estimate the commission that could be expected from the following data. 2.200 2,500 2,400 1,600 1,500 2,000 2, 100 2,300 The manager wanted to be 90% confident that the true mean was found The sample mean = ? QUESTION 13 A sales manager for an automobile parts retail store wanted to estimate the commission that could be expected from the following data. 2,200 2,500 2,400 1. 600 1,500 2,000 2,100 2,300 The manager wanted to be 90% confident that the true mean was found S = ? QUESTION 14 A sales manager for an automobile parts retail store wanted to estimate the commission that could be expected from the following data. 2.200 2,500 2.400 1,600 1.500 2,000 2100 2.300 The manager wanted to be 90% confident that the true mean was found Degrees of Freedom (df) =