How large a random sample is required

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Carbon resistors of mean resistance approximately 560 ohms are produced in a certain factory. The standard deviation is 28 ohms, and resistances are normally distributed.

a) What confidence level is associated with a single resistor falling within ± 10 ohms of the population mean?

b) How large a random sample is required to give 95% level of confidence that the sample mean is within ±10 ohms of the population mean?

Reference no: EM132495727

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