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Confidence interval for the mean usage in the march

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Reference no: EM132611523

A random sample of 30 households was selected as part of a study on electricity usage, and the number of kilowatt-hours (kWh) was recorded for each household in the sample for the March quarter of 2018. The average usage was found to be 375kWh. In a very large study in the March quarter of the previous year it was found that the standard deviation of usage was 81kWh. Assuming the standard deviation is unchanged and that the usage is normally distributed, provide the expression for calculating a 99% confidence interval for the mean usage in the March quarter of 2018.

Reference no: EM132611523

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