A Sales manager doubt that there is some problem with the filling of jars in a packaging plant and want to
show that the mean of the population of all jar fills that would be produced by the plant is less than 30 ounces. A random sample of 30 jars filled by a packaging plant is selected, and the mean and the variance of the corresponding jar fills are found to be 29 ounces and 0.12. Form and test the hypothesis at 10% level of significance. Write all the steps clearly.
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