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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?
You notice in your introductory psychology class that more women tend to sit up front, and more men in the back. To determine wheather this difference is significant, you collect data on the seating preferences for the students in your class. The dat..
a food inspector examamining 12 jars of a certain brand of peanut butter obtained the following percentages of
Standard deviation of $45. What is the probability that a randomly selected elementary school teacher earns more than $525 a week?
How much will Bob and Carol need to have in the bank on the day the baby is born in order to achieve all their goals? What amount needs to be saved at the end of each year in order for Bob and Carol to reach their financial goals?
carter motor company claims that its new sedan the libra will average better than 21 miles per gallon in the city.
It is estimated that 26% of all California adults are college graduates and that 31 % of California adults are regular internet users. It is also estimated that 20% of California adults are both college graduates and regular internet users.
The mean is a useful measure, but it can be misleading. Describe a circumstance when the mean is very useful as the average and a circumstance when the mean is very misleading as the average.
an experiment has four equally likely outcomes e1 e2 e3 and e4.a. what is the probability that e2 occurs?b. what is the
Find the probability that exactly 28 devices will work correctly.- Find the probability that at least 25 devices will work correctly.
NASA is planning many Mars missions with rover vehicles. A typical rover is a solar-powered vehicle which will see where it is going with TV cameras and will measure distance to objects with laser range finders.
The floor plan of a house is rectangular. The house's length is 2x-10 and its width is x+3. Write an expression for the area of the house
In other words, what other variables might you collect that you might plausibly expect to have an impact on the change in test scores aside from income and the curriculum type?
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