According to the local union president

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According to the local union president, the mean gross income of plumbers in the Salt Lake City area follows the normal probability distribution with a mean of $45,000 and a standard deviation of $3,000. A recent investigative reporter for KYAK TV found, for a sample of 120 plumbers, the mean gross income was $45,500. At the .10 significance level, is it reason- able to conclude that the mean income is not equal to $45,000? Determine the p-value.

Reference no: EM131109754

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