21. According to the local union president, the mean gross income of plumbers in the Salt level, is it reasonable to conclude that the mean income is not equal to $45,000? Deter- sample of 120...

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Extracted text: 21. According to the local union president, the mean gross income of plumbers in the Salt level, is it reasonable to conclude that the mean income is not equal to $45,000? Deter- sample of 120 plumbers, the mean gross income was $45,500. At the .10 significance standard deviation of $3,000. A recent investigative reporter for KYAK TV found, for a Lake City area follows the normal probability distribution with a mean of $45,000 and a mine the p-value. hark mulch in 50-pound hane