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In: Statistics and Probability

Problem 1: According to the local union president, the mean gross income of plumbers in the...

Problem 1: According to the local union president, the mean gross income of plumbers in the Salt Lake City area follows a normal distribution with a mean of $48,000 and a population standard deviation of $2,000. A recent investigative reporter for KYAK TV found, for a sample of 49 plumbers, the mean gross income was $47,600. At the 0.05 significance level, is it reasonable to conclude that the mean income is not equal to $47,600? Determine the p value.

1. State the Null and Alternate hypothesis:

2. State the test statistic:

3. State the Decision Rule: since the variance of the population is know, I used the

4. Show the calculation:

5. What is the interpretation of the sample data?

6. Show the P value

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orchestra answered 1 year ago
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