Mean gross income of plumbers in the salt lake city

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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 0.10 significance level, is it reasonable to conclude that the mean income is not equal to $45,000?

Determine the p-value. (Round your answer to 4 decimal places.)

given the following hypotheses: 

H0: μ = 100

H1: μ ≠ 100

A random sample of six resulted in the following values: 118, 105, 112, 119, 105, and 111. Assume a normal population.

  1. Estimate the p-value.

Reference no: EM132409062

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