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According to the U.S. Bureau of Labor Statistics, the average weekly earnings of a production worker...

According to the U.S. Bureau of Labor Statistics, the average weekly earnings of a production worker in July 2011 were $657.49. Suppose a labor researcher wants to test to determine whether this figure is still accurate today. The researcher randomly selects 52 production workers from across the United States and obtains a representative earnings statement for one week from each. The resulting sample average is $671.11. Assuming a population standard deviation of $63.90 and a 10% level of significance, determine whether the mean weekly earnings of a production worker have changed.

(Round your answer to 2 decimal places.)

The value of the test statistic is __________ and we

A) fail to reject the null hypothesis

or

B) reject the null hypothesis.
math   Statistics-And-Probability   
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Answer #1

solution to: M = 657.49 us Hi: M7657.49 Thest statistic X-M 2 - lun 671.11- 657.49 1.537 63.901552 Critical vale zx12 Z 20100

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