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Question: A medical researcher wants to estimate the difference in the proportions of women with high blood pressure for women who use oral contraceptives versus women who do not use oral contraceptives. In an observational study involving a sample of 900 women, the researcher finds that .15 (15%) of the 500 women who used oral contraceptives had high blood pressure, whereas only .10 (10%) of the 400 women who did not use oral contraceptives had high blood pressure.
a. What is the research question of interest for this study?
b. What is the population parameter in this study? What is the appropriate statistical notation for this parameter?
c. What is the value of the sample estimate (statistic) in this study? What is the appropriate statistical notation for this estimate?
Which of the models of this chapter would you use to model the number of households Pew has to call before they get the first completed interview?
There are seven cards with digits 0,1, 2, 3, 4, 5, and 6. A child takes four of the cards and places them in some order. What is the probability that he obtains a four-digit number less than 3265?
Discuss some of the advantages and disadvantages of the WHO protocol versus the single test. Give the assumptions that you have made in carrying out calculations.
Absenteeism. A company's records indicate that on any given day about 1% of their day-shift employees and 2% of the night-shift employees will miss work.
each of four persons named 1234 fires one shot at a target. let ak denote the event that person k hits the targetwhere
a random sample of 12 men and 12 women were asked to report the number of hours they watched television on a wednesday
Dan Thompson, the president of CEO Airlines, recently noted an increase in the number of no-shows for flights out of Atlanta.
Previously, it was shown that if X and Y are independent random variables, then τ (8.2) has a value of 0. Show that the converse is not true by constructing a joint probability distribution for the pair of random variables X and Y such that τ = 0 ..
What is a hypothesis test? Why do we need to use them to make decisions about relating sample results to the population; why can't we just make our decisions by the sample value?
Develop the appropriate 3-sigma control chart(s) for this process. Does the process appear to be working as intended (in control)?
A simple random sample of 50 adults Is obtained and each person's red blood cell count is measured (in microliters).The sample mean is 4.23.The population standard deviation for red blood cell counts is .40.Construct a 99% confidence interval esti..
according to usa today snapshot 3 of americans surveyed lie frequently. you conduct a survey of 500 college students
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