Question 6: A machine fills bottles with 64 ounces of liquid. The quality-control manager determines that the fill levels are normally distributed with a mean of 64 ounces and a standard deviation of 0.42 ounces. He has an engineering recalibration machine in an attempt to lower the standard deviation. After recalibration, the quality-control manager randomly selects 19 bottles from the line and determines that the standard deviation is 0.38 ounces. Is there less variability in the filling machine? Use a = 0.1. . Find the null and alternative hypotheses. . Find the test statistic. • Find the p-value • Draw a conclusion about the null hypothesis.

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