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Do ethnic group and gender influence the type of care that a heart patient receives? The following passage is from the article "Heart Care Reflects Race and Sex, Not Symptoms" (USA Today, February 25, 1999, reprinted with permission): Previous research suggested blacks and women were less likely than whites and men to get cardiac catheterization or coronary bypass surgery for chest pain or a heart attack. Scientists blamed differences in illness severity, insurance coverage, patient preference, and health care access. The researchers eliminated those differences by videotaping actors-two black men, two black women, two white men, and two white women-describing chest pain from identical scripts. They wore identical gowns, used identical gestures, and were taped from the same position. Researchers asked 720 primary care doctors at meetings of the American College of Physicians or the American Academy of Family Physicians to watch a tape and recommend care. The doctors thought the study focused on clinical decision making.
a. Evaluate this experimental design. Do you think this is a good design or a poor design, and why?
b. If you were designing such a study, what, if anything, would you propose to do differently?
Use an appropriate 95 percent confidence interval to estimate the difference between the mean prices of the two brands of cd players. Do you think that the difference haspractical importance?
One of 4 bus drivers is also arbitarily selected. Let Y denote number of students on his bus. Calculate the expectations of X and Y.
You are running a clinic providing HIV therapy in a rural area. You want to know what proportion of HIV positive you are serving. If it is greater than 80%, you will conduct outreach. a. What type of study would yield the information you need?
Psychology and Human Behavior During each summer, many families spend part of their vacation time at a beach along the East or West Coast.
Verify that the function corresponding to the following figure is a valid probability density function. Then find the following probabilities
How do they relate to strategic human resource management? Be sure to explain this relationship in terms of the resource-based view of the firm and sustainable competitive advantage.
Test whether there is a statistical difference between the two proportions at the 5% significance level.
Give a 95% confidence interval for the mean of the population from which the sample is drawn.
The study does not give sufficient evidence to support the claim that less than 75% of college students spend less than $250 per semester on textbooks.
A group of 12 hemophiliacs, all under 41 years of age at the time of HIV seroconversion, were followed from primary AIDS diagnosis until death (ideally, we should take as a starting point the time at which a person contracts AIDS rather than the t..
If that point were removed from the data, would the correlation become stronger or weaker? Explain.- If that point were removed from the data, would the slope of the regression line increase or decrease? Explain.
The heights of young women are approximately normal with mean 65 inches and standard deviation 2.5 inches.
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