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SOLVED: The Brinell scale is a measure of how hard a material is. An engineer hypothesizes that the meanBrinell score of all subcritically annealed ductile iron pieces is not equal to 170. The engineermeasured the Brinell score of 25 pieces of this type of iron and calculated the sample mean tobe 174.52 and the sample standard deviation to be 10.31. Perform a hypothesis test that thetrue average Brinell score is not equal to 170, as well as the corresponding confidence interval.Set alpha = 0.01.
SOLVED: The Brinell scale is a measure of how hard a material is. An engineer hypothesizes that the meanBrinell score of all subcritically annealed ductile iron pieces is not equal to 170. The engineermeasured the Brinell score of 25 pieces of this type of iron and calculated the sample mean tobe 174.52 and the sample standard deviation to be 10.31. Perform a hypothesis test that thetrue average Brinell score is not equal to 170, as well as the corresponding confidence interval.Set alpha = 0.01.
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