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Problems at major companies. The Organization Development Journal(Summer 2006) reported on the results of a survey on human resource officers (HROs) at major Employers located in a southeastern city. The focus of the study was employee behavior, namely absenteeism, promptness to work, and turnover. The study found that 55% of the HRSOs had problems with employee absenteeism; also 41% had problems with turnover. Suppose that 22% of the HROS had problems with both absenteeism and turnover. Use this information to find the probability that an HRO officer selected from the group surveyed had problems with either employee absenteeism or employee turnover.
The BATF wants to evaluate true average lead level for California wines to within 29 parts per billion at 95% level of confidence?
You are planning to test a vaccine for a virus that has no vaccine. Since the disease is usually not serious, you will expose 100 volunteers to the virus. After some time, you will record whether or not each volunteer has been infected.
Create a 95% confidence interval for true mean debt for student borrowers.
Past studies have revealed that only 88% of booked passengers actually arrive for flight.) Determine probability that if airline books 17 persons, not adequate seats will be available.
The amount of time the university professors devote to their jobs per week is normally distributed with a mean of 52 hours and a standard deviation of 6 hours.
There're several advantages of using a paired t-test. Since the same subjects are being tested in each of the varying conditions, those subjects serve as their own control.
You only worry if there is at least a 50 or more percent chance that you have the disease. Suppose that test has same specificity = p For what value of p will you start to worry?
Draw the standard normal distribution, label the axis, locate both z-scores on the axis (z7 = -1.5, z15 = 2.5), and shade an area equal to the probability that a randomly chosen croaker fish will be b/t 7 and 15 inches.
Develop mathematical functions that compute the annual ordering cost and annual holding cost based on average inventory held throughout the year in order to arrive at a model for total cost.
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
Stating assumptions on which your arguments and conclusions are based, sum up the statistical evidence regarding effectiveness of this diet.
The sensitivity of a test is the probability that a person having the disease will test positive (indicating the person has the disease, i.e., it's the probability the test will pick up the fact that a person has the disease).
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