Significance of the apparent increase in variability

Reference no: EM13975125

The standard deviation of the breaking strengths of certain cables produced by a company is given as 240 pounds (lb). After a change was introduced in the process of manufacture of these cables, the breaking strengths of a sample of eight cables showed a standard deviation of 300 lb. Investigate the significance of the apparent increase in variability, using significance levels of (a) 0.05 and (b) 0.01.

Reference no: EM13975125

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