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Hollow is proud of their energy saving program. A sample of 29 houses reveals an average saving of 47.5 kilowatt hours per week with a standard deviation of 55. Find the t score for a 90% confidence limit.
Based on the answer from question 9, calculate 90% confidence limit around your best estimate of the average savings.
What is the underlying difference between the T-test and the Z-test? Provide an example of nominal information and write a work related survey question that would collect nominal data:
what is the correlation between leadership trustworthiness and ethical stewardship? support your
There are 8 members on the board of directors. If the board must form a committee of 6 members, how many different ways may the committee be selected from among the 8 board members?
through years of careful observation you have begun to suspect that how vocal cats are is somehow related to the
suppose the estimated slope coefficient in a regression model measuring the association between the independent
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
Using the following 12 numbers (12, 34, 23, 10, 9, 45, 14, 34, 12, 13, 13, 35), calculate 1. the median 2. the mode 3. the mean
Find the 95% confidence interval of the mean score for all 50 golfers. Find the 95% confidence interval of the mean score for all golfers if this is a sample of 80 golfers instead of a sample of 50.
Table 1 shows the number of applicants to graduate school at Berkeley for the six largest departments in 1973 by gender and department. Table 2 shows the number of rejected applicants by gender and department. Recall the notation GM, GF , DA, DB, ..
After approval by the Academic Director, the application form is returned to the Registrar who creates a student file. The Accounts department receive the application form and using information from the student file creates an invoice that is sent..
the average annual age of doctors in a certain hospital is 44.0 years old with a standard deviation of 4.0 years.
Use a hypothesis test to gain insight into whether or not the data collected by the students are fabricated. Use a level of significance that gives the benefit of the doubt to the students.
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