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In a public health survey in a rural county, information was obtained on age and the question: Do you have one person you think of as your personal doctor?
The patients were grouped into three age groups. There were 99 respondents who were 18-34 years old, of whom 70 said yes; 506 respondents who were 35-64 years old, of whom 430 said yes; and 220 respondents who were 65 years old or older, of whom 204 said yes. Test whether the three groups are equally likely to have one person who they think of as their personal doctor.
What is a test statistic and how is it related to a critical value in hypothesis testing? What is the critical region in hypothesis testing and why is it important?
Drugstore was the first e-commerce company to offer Internet drugstore retailing. Drugstore.com customers were provided the opportunity to buy health, beauty, personal care, wellness, and pharmaceutical replenishment products over the Internet.
A linear correlation coefficient very close to 0 implies that there is a linear correlation between the averages, but a correlation between the averages does not imply a correlation between individuals as the conclusion incorrectly suggest.
the national center for education statistics reported that 47 of college students work to pay for tuition and living
Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
find an equation of the tangent plane and find symmetric equations of the normal line to the surface zxy at the point
Why don't researchers who want to test hypotheses about the relationships between variables worry a great deal about random sampling?
1. if the alpha level is changed from a of 0.05 to a 0.01 what happens to the probability of type 1 error ?2.answer the
Develop a simulation for finding the probability that when 50 people are randomly selected, at least three of them have the same birth date. Describe the simulation and estimate the probability.
Does lovastatin (a cholesterol-lowering drug) reduce the risk of heart attack? In a Texas study,researchers gave lovastatin to 2,325 people and an inactive substitute to 2,081 people
find the probability using the binomial distribution of obtaining 2 or more nonconforming units when sampling 5
To model this fact, we assume that only half of the goods produced during a week can be used to meet the current week's demand (assume that all of the prior week's ending inventory can be used to meet the current week's demand). Determine how to m..
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