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The stability of measurements of the characteristics of a manufactured product is important in maintaining product quality. In fact, it is sometimes better to obtain small variation in the measured value of some important characteristic of a product and have the process mean slightly off target than to get wide variation with a mean value that perfectly fits requirements. The latter situation may produce a higher percentage of defective product than the former.
A manufacturer of light bulbs suspected that one of his production lines was producing bulbs with a high variation in length of life. To test this theory, he compared the lengths of life of n = 50 bulbs randomly sampled from the suspect line and n = 50 from a line that seemed to be in control. The sample means and variances for the two samples were as shown in the following table.
a. Do the data provide sufficient evidence to indicate that bulbs produced by the suspect line possess a larger variance in length of life than those produced by the line that is assumed to be in control? Use α = .05.
b. Find the approximate observed significance level for the test and interpret its value.
topic monopolistic competition. 1. consider the village of fanjeaux - a beautiful bucolic historic but remote village
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Estimates of the maximum amounts of output possible with different combinations of two input factors, X and Y.
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