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 1.4 kWh. The mean electricity usage per family was found to be 15.5 kWh per day for a sample of 142 families. Construct the 80% confidence interval for the mean usage of electricity. Round your answers to one decimal place.
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 1.4 kWh. The mean electricity usage per family was found to be 15.5 kWh per day for a sample of 142 families. Construct the 80% confidence interval for the mean usage of electricity. Round your answers to one decimal place.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section: Chapter Questions
Problem 22SGR
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