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:____________
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. They would like the estimate to have a maximum error of 0.14 kWh. A previous study found that for an average family the standard deviation is 2.4 kWh and the mean is 16.3 kWh per day. If they are using a 90% level of confidence, how large of a sample is required to estimate the mean usage of electricity? Round...
The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. They would like the estimate to have a maximum error of 0.12 kWh. A previous study found that for an average family the variance is 1.96 kWh and the mean is 15.1 kWh per day. If they are using a 95% level of confidence, how large of a sample is required to estimate the mean usage of electricity? Round your...
The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. They would like the estimate to have a maximum error of 0.15 kWh. A previous study found that for an average family the standard deviation is 2.5 kWh and the mean is 15.9 kWh per day. If they are using a 85% level of confidence, how large of a sample is required to estimate the mean usage of electricity? Round...
PLEASE DOUBLE CHECK ANSWERS ARE CORRECT The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. They would like the estimate to have a maximum error of 0.14 kWh. A previous study found that for an average family the variance is 5.29 kWh and the mean is 16.6 kWh per day. If they are using a 80% level of confidence, how large of a sample is required to estimate the...
The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. Assume that the population standard deviation is 1.9 gallons. The mean water usage per family was found to be 16.5 gallons per day for a sample of 1000 families. Construct the 98% confidence interval for the mean usage of water. Round your answers to one decimal place. Answer low to Enter) 1 Point m Tables Keypad...
(2 pts) The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. Assume that the population standard deviation is 2.3 gallons. The mean water usage per family was found to be 18.5 gallons per day for a sample of 717 families. Construct the 80% confidence interval for the mean usage of water. Round your answers to one decimal place. Answer: Lower endpoint: Upper endpoint:
the electric cooperative needs to know the mean household usage Question 9 of 14, Step 1 of 1 5/14 Correct Aresearch scholar wants to know how many times per hour a certain strand of virus reproduces. The mean is found to be 6.4 reproductions and the population standard deviation is known to be 2.4. Wa Bample of 955 was used for the study construct the 99 confidence interval for the true mean number of reproductions per hour for the virus....
The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. Assume that the population standard deviation is 1.2 gallons. The mean water usage per family was found to be 16.5 gallons per day for a sample of 1075 families. Construct the 99%confidence interval for the mean usage of water. Round your answers to one decimal place.
The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. Assume that the population standard deviation is 1.7 gallons. The mean water usage per family was found to be 15.8 gallons per day for a sample of 249 families. Construct the 80% confidence interval for the mean usage of water. Round your answers to one decimal place.
The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. Assume that the population standard deviation is 1.6 gallons. The mean water usage per family was found to be 14.6 gallons per day for a sample of 164 families. Construct the 80% confidence interval for the mean usage of water. Round your answers to one decimal place.