Mathematics, 10.03.2020 03:01 jordanmartinezacierr
The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. Assume that the population standard deviation is 2.4 kWh. The mean electricity usage per family was found to be 17.5 kWh per day for a sample of 796 families. Construct the 90% confidence interval for the mean usage of electricity. Round your answers to one decimal place.
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