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A multicenter clinical trial involving 17,000 patients suspected of having acute myocardial infarction was conducted. The vascular death rate after 5 weeks was compared in patients receiving aspirin versus those not receiving aspirin, regardless of any other concomitant treatment. The relative risk (RR) for the effect of aspirin relative to no aspirin is 0.80 and the relative risk reduction (RRR) is 0.20. Interpret the RR and RRR results.
State the null and alternate hypotheses if you want to determine whether the mean amount spent is higher for men than for women,
Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children.
A bridge hand consists of 13 cards dealt at random from an ordinary deck of 52 playing cards. How many possible bridge hands are there?
Use an alpha level of .01 and test the hypothesis that the two methods are producing the same mean.
What is the difference in appearance between a t-distribution and a z-distribution? Why do they have slightly different appearances?
What purpose does a multiple regression analysis serve? Give an example of how it might be used in marketing research.
Construct a frequency distribution of the sample mean, and plot a histogram of this distribution. Use the central limit theorem to calculate and identify the sampling distribution of the sample mean.
How does a researcher determine the meaning of a score on a norm-referenced test such as an IQ test? Why are raw scores transformed to standardized scores, such as z-scores, in order to interpret those raw scores?
It is very difficult for small businesses to be successful. The Small business administration estimates that 20 percent will dissolve or go bankrupt within two years. A sample of 50 new businesses is selected. (show work) (a) What is the mean and ..
You are interested in knowing if there is a statistical difference in driving speeds between Day 1 and Day 10. Which statistical test would be appropriate? Why?
A student is taking a multiple choice exam in which each question has four choices . Assume that the student has knowledge of a correct answer to any of the questions.
Plot the control limits for the mean outside diameter and the range.
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