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Question: Preventing strokes Aspirin prevents blood from clotting and so helps prevent strokes. The Second European Stroke Prevention Study asked whether adding another anticlotting drug named dipyridamole would be more effective for patients who had already had a stroke. Here are the data on strokes during the two years of the study:20
(a) Summarize these data in a two-way table. Then compare the stroke rates for the four treatments.
(b) Explain in words what the null hypothesis H0:p1 = p2 = p3 = p4 says about the incidence of strokes.
(c) Do the data provide convincing evidence of a difference in the effectiveness of the four treatments at the a = 0.05 significance level?
Physical Sciences The Quabbin Reservoir in Massachusetts is 18 miles long and has a capacity of 412 billion gallons.
Checking for survey errors One way of checking the effect of undercoverage, nonresponse, and other sources of error in a sample survey is to compare the sample.
What is the strength of the correlations between the variables? What measure of quality is impacted most by relationship conflict? Task Conflict? What is the significance of the correlations?
a. draw a normal probability plot for the data set derived according to these instructions. show all the calculations
The relative risk of contracting a certain coronary disease is 2.0 for male smokers compared to male nonsmokers and 3.0 for female smokers compared to female.
what is the formula of t-quantile distribution needed to calculate an exact 90 confidence interval for the
You will actually have negative sales using this multiple regression analysis
For each of the following datasets, explain whether you would expect the mean or the median of the observations to be higher:- In a rural farming community, for each household the number of children is measured.
In a recent year, 11th grade New York public school students taking an English test produced test scores that were normally distributed with a mean of 81 and a standard deviation of 6. Let x be a random variable that represents a test score.
If the process mean is not significantly different from the target value, it is also desirable for the average run length to be 300. Find the parameters of an appropriate V-mask.
Chi-square tests are great to show if distributions differ or if two variables interact in producing outcomes. What are some examples of variables that you might want to check using the chi-square tests? What would these results tell you?
Biology and Environment Science Motor vehicles contribute approximately 15% of all carbon dioxide released into the atmosphere each year.
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