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Suppose researchers have reported that the population mean for the annual salary of certified welders was...

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Statistics

Suppose researchers have reported that the population mean for theannual salary of certified welders was $40,000, and the populationstandard deviation was $5200. A new survey of 200 welders wastaken, and the mean annual salary of this sample was $39,000. Atthe 0.05 significance level, can we conclude that the mean annualsalary of certified welders is less than $40,000? Complete steps 1through 6 below.

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Here we have to test thatNull hypothesis Alternative hypothesis where This hypothesis test is left tailed testn    See Answer
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