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A sample of 126 corporate managers and another sample of 168 college professors produced mean job-related stress scores of 7.35 for the managers and 6.86 for the professors. Suppose that the standard deviations of the stress scores are 1.12 for the managers and 1.82 for the professors. The null hypothesis is that the mean stress scores are the same for corporate managers and college professors, while the alternative hypothesis is that the mean stress score for managers is different from the mean stress score for professors. The significance level for the test is 1%. What are the critical values of z?
during the past six months 73.2 of us households purchased sugar. assume that these expenditures are approximately
What role did the West play in such crucial issues of the period as the tariff, internal improvements, and the expansion of slavery?
Recall that in Exercise 45 the personnel director for Electronics Associates developed the following estimated regression equation relating an employee's score on a job satisfaction test to length of service and wage rate.
According to the Bureau of Labor Statistics (1996), the average price of a gallon of gasoline in all U.S. cities in the United States in January 1996 was $1.129. A later random sample in 24 cities found the mean price to be $1.24 with a standard d..
Estimate Confidence Interval for the population mean with Confidence Level 99% in two cases:
Compute the z-score corresponding to each of the following values of x: What is the 50th percentile of a quantitative data set called?
The coefficient of determination explains (a) The amount of variation in the independent variable explained by the dependent variable;
A manager is thinking of providing, on a regular basis, in-house training for employees preparing for an inventory management certification exam. In the past, some employees received the in-house training before taking the exam, while others did n..
The incidence of bone cancer through 1970 among the 1,000 women working in manufacturing was compared with that of 1,000 women working in administrative offices
A cohort study was designed to look at the association of pesticides and the occurrence of childhood leukemia. Children living in rural areas were followed and leukemia rates were compared between those children living in areas with high and low p..
(Scheduling Problems Viewed as Assignment Problems) A machine can be used to perform a subset of N given tasks over T time periods. At each time period t, only a subset A(t) of tasks can be performed. Each task j has value j (t) when performed at ..
Which statistic technique can use.. when apply three treatment(treatment 1, treatment2, treatment3)on 2 dependent variable?(i applied 3 treatments consecutively and checked effect of them on 2 dependents variable. can i apply repeated measure of anov..
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