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QUESTION 3 10 points Save? In order to estimate the average electric usage per month a...
1) For the t distribution with 16 degrees of freedom, find the value for which the...
1) For the t distribution with 16 degrees of freedom, find the value for which the upper tail area is 0.005. 2) For the t distribution with 13 degrees of freedom, calculate P(T < 1.771). 3) In order to estimate the average electric usage per month, a sample of 45 houses were selected and the electric usage determined. The sample mean is 2,000 KWH. Assume a population standard deviation of 101 kilowatt hours. At 90% confidence, compute the margin of...
In order to estimate the average electricity usage per month, a sample of 15 houses was...
In order to estimate the average electricity usage per month, a sample of 15 houses was selected, and the electricity usage was determined. Assume a population variance of 10,000kWh2. Find the 98% confidence interval for the mean electricity usage in kilowatt hours. Round your answers to the nearest integer and use ascending order. Electric Usage 1240, 750, 955, 668 ,841, 1203 ,631, 850 ,711, 1083, 953 ,891 ,1030, 804 ,1120 (_,_)
a)A sample of 30 patients in a doctor's office showed that they had to wait for...
a)A sample of 30 patients in a doctor's office showed that they had to wait for an average of 33 minutes before they could see the doctor. The sample standard deviation is 14 minutes. Assume the population of waiting times is normally distributed.At 90% confidence, compute the lower bound of interval estimate for the average waiting time of all the patients who visit this doctor. b)A university planner wants to determine the proportion of spring semester students who will attend...
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...
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...
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:____________
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 0.12 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...
PLEASE DOUBLE CHECK ANSWERS ARE CORRECT The electric cooperative needs to know the mean household usage...
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...
In order to estimate the average time spent on the computer terminals per student at a...
In order to estimate the average time spent on the computer terminals per student at a local university, data were collected from a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.2 hours. If the sample mean is 9 hours, then the 95% confidence interval is approximately a. The 95% interval because it is a less accurate interval. The 95% interval because it is a less accurate interval. b. The 99% interval because...
The average American young adult spends $140 on smartphone expenses per month, with a known population...
The average American young adult spends $140 on smartphone expenses per month, with a known population standard deviation of 28.2. In order to compute a confidence interval estimate for the population mean, a sample of 66 observations is drawn. Use Table 1. a. Is the condition that X−X− is normally distributed satisfied? Yes No b. Compute the margin of error at a 95% confidence level. (Round intermediate calculations to 4 decimal places. Round final answer to 2 decimal places.) Margin of...
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