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Gre4nikov [31]
3 years ago
8

According to the local union president, the mean gross income of plumbers in the Salt Lake City area follows the normal probabil

ity 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?
Business
1 answer:
abruzzese [7]3 years ago
7 0

Answer: 49,010.5263

Explanation:  Add 45'000, 4,000, 10,divided by 95%

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