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A researcher demonstrated a correlation of r = 0.60 between teacher attire and student academic performance across 150 grade schools in her state. She concluded that encouraging teachers to be properly attired will increase academic performance. Do you agree or disagree with her conclusion? Why?
Entities arrive at single-server queuing system at average of 4 per hour and server can service average of 5 per hour. Mean in the queue is?
At a = 0.05, what is the test value?
Determine the point estimate and 95% confidence interval for the mean family dental expenses of all employees of the company.
An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a standard deviation of $78.11.
The following frequency table lists the sales of an item and the number of times it has occurred. It was obtained from historical records. Sales/Frequency: 10/100, 15/120, 20/300, 25/350, 30/400, 35/500, 40/300, 45/170.
Sampling variability refers to the idea that different samples will include different individuals
Use given data to create the unbiased point estimate of 12σ'> 2 of percentage of termites that are minor workers.
The probability of a bulb lasting less than 2300 is .1573. The maximum probability of a bulb lasting less than 2300 hours should be only 5%. What must change specifically? How would that change be obtained practically?
In what situations might you use probability as a manager to approach business-related problems? What are the advantages to using probability concepts in business decisions?
A local politician in this town has stated that the average property taxes are $1800 and most people do not pay more than this amount. Conduct a test at the alpha = .01 level to determine if this is true. For this test, consider a sample size of 3..
A survey of middle-aged men reveals that 28% of them are balding at the crown of their heads. Moreover, it is known that 18% of all middle-aged men who have this balding pattern will suffer a heart attack in the next 10 years.
Develop a forecast for year 6, using two-year moving average and trend analysis. Identify which method is most appropriate for this data set
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