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The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers...

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 1.5 kWh. The mean electricity usage per family was found to be 19.5 kWh per day for a sample of 271 families. Construct the 90% confidence interval for the mean usage of electricity.

Lower Endpoint: _______________ and Upper Endpoint:____________

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Answer #1

Sche Guven thod 19S 6-1:5 de 1-90% X2 2 V21 (79: 35) 1365 Lower-Endpoint UppelEndpoint tig-2S 三19:65

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