. A random sample of 30 warehouses was selected as part of a tudy on electricity usage, and the number of kilowatt-hours kWh) was recorded for each warehouse in the sample for the March quarter of 2019. The average usage was found to be 75kWh. In a very large study in the March quarter of the revious year it was found that the standard deviation of the sage was 81kWh. It is believed that the standard deviation

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2. A random sample of 30 warehouses was selected as part of a
study on electricity usage, and the number of kilowatt-hours
(kWh) was recorded for each warehouse in the sample for the
March quarter of 2019. 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 the
usage was 81kWh. It is believed that the standard deviation
may have changed from the previous year. From the small
data set in 2019, the sample standard deviation is 91.5kWh.
Assuming that the usage is normally distributed, calculate a
99% confidence interval for the mean usage in the March
quarter of 2019.
Transcribed Image Text:2. A random sample of 30 warehouses was selected as part of a study on electricity usage, and the number of kilowatt-hours (kWh) was recorded for each warehouse in the sample for the March quarter of 2019. 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 the usage was 81kWh. It is believed that the standard deviation may have changed from the previous year. From the small data set in 2019, the sample standard deviation is 91.5kWh. Assuming that the usage is normally distributed, calculate a 99% confidence interval for the mean usage in the March quarter of 2019.
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