  # 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 March of 2006. The average usage was found to be 375kWh with a standard deviation of 81kWh. Assuming the usage is normally distributed, provide a 99% confidence interval for the mean usage in March of 2006.

Question

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 March of 2006. The average usage was found to be 375kWh with a standard deviation of 81kWh. Assuming the usage is normally distributed, provide a 99% confidence interval for the mean usage in March of 2006.

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Step 1

It is given that sample mean is 375 kWh ...

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