9.26 In producing resistors, variability of the resistances is an important quantity to study, as it reflects

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9.26 In producing resistors, variability of the resistances is an important quantity to study, as it reflects the stability of the manufacturing process. Estimate , the true variance of the resistance measurements, in a 90% confidence interval, if a sample of 15 resistors showed resistances with a standard deviation of 0.5 ohm.

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