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The Human Resources Director for a large company is studying absenteeism among hourly workers, A sample of 120 day shift employees showed 15 were absent more than 5 days last year. A sample of 80 afternoon workers showed 18 to be absent 5 times or more last year. We want to test a hypothesis at the .01 level of significance. Based on your computations, would we reject or fail to reject the null hypothesis?
Assume the probability that a person has the desease is 0.03 for all people, independently of each other, and compute the expected number of tests necessary for each group.
Merrill Lynch Securities and Health Care Retirement, Inc., are two large employers in downtown Toledo, Ohio. They are considering jointly offering child care for their employees.
Suppose the random variable x is best described by a normal distribution with µ = 24 and σ = 2.7. Find the z-score that corresponds to each of the following x values.
Briefly explain the advantage of using an alpha level of 0.01 verus a level of .05. general, what is the disavantage of using a smaller alpha level?
Delta Airlines quotes a flight time of 2 hrs, 5 minutes for its flights from Cincinnati to Tampa. We belive that actual flight times are uniformly distriubted between 2 hours and 2 hours 20 minutes.
He stuffs each letter into one of the preaddressed envelopes and seals them. What is the probability that each letter is in the correct envelope?
Suppose the average value of P is $ 3 and average value of Po is $ 6. Determine the price elasticity at average values of P and Po?
Based on these data, what is the probability that next Christmas will be dry and based on the data,what is the probability that next Christmas will be rainy or cloudy and dry?
Of 1338 people who came into a blood bank to give blood, 253 people had high blood pressure. Estimate the probability that the next person who comes in to give blood will have high blood pressure.
The number of defects per foot Y is assumed to have a Poisson distribution with mean = 2. i) What is the probability of observing 3 defects in 4 feet of wire?
Scores of an aptitude test are normally distributed with a mean of 280 and a standard deviation of 30. Determine the percentage of samples of size 4 that have a mean score within 21 points of the population mean score of 280.
the population of completion times is 10.4 minutes, what is the minimum sample size needed for the managers to be 95% confident that their estimate is within 2.2 minutes of u?
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