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For a certain standardized placement, it was found that the scores were normally distributed, with a mean of 200 and a standard deviation of 30. Suppose that this test is given to 1000 students. What is the number of students that are expected to make scores between 170 and 230?
The dying rate in an industrial process is department of many factors and varies according to the following distribution.
During a professor's office hours, students arrive, on average, every ten minutes. Assume that the distribution of the time between arrivals follows an exponential distribution. Suppose that a student has just left.
A physiologist wishes to study the effect of birth control pills on exercise capacity. Five female subjects who have never taken the pill have their maximal oxygen uptake measured during a treadmill session.
Describe the data for a correlational research study. Explain how correlational research is different from other research evaluating the relationship between two variables.
Acme plumbing supply just received a shipment of 5,000 stainless steel valves, but 50 regular steel valves were also sent. There is no way to tell the difference between the valves.
If we select a crew member at random, what is the probability the crew member earns:
What does this story say about hypothesis testing and research? What is the likelihood of this happening? There are number of safeguards in place so this should not happen.
Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
What different types of variables are used in quantitative studies? Describe each type of variable and how they differ.
Test hypothesis that annual incomes of corporate trainers in areas of more than 500,000 are considerably more than those in areas of less than 100,000. Make use of the 5% level of risk.
Body mass index is calculated by dividing a persons weight by the square of his or her height; it is a measure of the extent to which the individual is overweight.
Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points.
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