A machine is used to ll boxes with product in an assembly
Chapter 1, Problem 9.109(choose chapter or problem)
A machine is used to ll boxes with product in an assembly line operation. Much concern centers around the variability in the number of ounces of product in a box. The standard deviation in weight of product is known to be 0.3 ounce. An improvement is implemented, after which a random sample of 20 boxes is selected and the sample variance is found to be 0.045 ounce2. Find a 95% condence interval on the variance in the weight of the product. Does it appear from the range of the condence interval that the improvement of the process enhanced quality as far as variability is concerned? Assume normality on the distribution of weights of product.
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