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Confidence interval for the mean usage in the march quarter

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Reference no: EM132611525

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. It is believed that the standard deviation may have changed from the previous year. From the 2018 sample, the sample standard deviation is 91.5kWh. Assuming that the usage is normally distributed, provide an expression for calculating a 99% confidence interval for the mean usage in the March quarter of 2018.

Reference no: EM132611525

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