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AARP reported on a study conducted to learn how long it takes individuals to prepare their federal income tax return (AARP Bulletin, April 2008). The data contained in the file named TaxReturn are consistent with the study results. These data provide the time in hours required for 40 individuals to complete their federal income tax returns. Using past years' data, the population standard deviation can be assumed known with σ=9 hours.
There are two rejected units. If a customer orders 180 units, what is the probability that the delivery will have at least one reject unit?
Make a scatter diagram of the scores; (b) describe in words the general pattern of correlation, if any (c) figure the correlation coefficient; (d) figure whether the correlation is statistically significant.
Joe is considering pursuing an MBA degree. He has applied to two different universities. The acceptance rate for applicants with similar qualifications is 25% for University A and 40% for University B.
At the .05 significance level, can we conclude that the guideline is still reasonable?
Develop a hypothesis to investigate this problem based on the claim of the heat pump manufacturer
Consider you have completed a survey of employees working in a call center doing customer service for a major manufacturing company.
At the present time, the warehouse is 40 feet deep. How many feet of depth should be added on the warehouse to minimize the annual inventory costs?
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
For the population with standard deviation of σ =10 a score of x=44 corresponds to z= -0.50. Determine the population mean?
X2 is college board score (range 200-800). Use the multiple regression equation to predict college gpa for a high school gpa of 3.6 and a college board score of 600.
Suppose the FBI set of goal of 10% for breakins, and they want to see if the current data show they are below that mark. What are the appropriate null and alternative hypotheses?
Quality control engineer has been checking output by almost continuous sampling as abnormal condition began. Determine the probability that in sample of 10 pieces.
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