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The New York Times ran a story headlined "Study Shows Marathons Aren't Likely To KillYou," claiming that the risk of dying on a marathon is twice as high if you drive it than if you run it. The underlying study (Redelmeier and Greenwald 2007) estimated risks for running marathons and for driving. The measure of risk was deaths per day. The study compared deaths per day from driving on marathon days to deaths per day from driving on control days without marathons. The rate on marathon days was lower. (Roads are closed during marathons; control days were matched to marathon days on day of the week, and the same time periods were used; data on traffic fatalities were available only at the county level.) The study concluded that 46 lives per day were saved by road closures, compared to 26 sudden cardiac deaths among the marathon runners, for a net saving of 20 lives. What's wrong with this picture? Comment first on the study, then on the newspaper article.
Finding appropriate z- and t-scores is important when constructing confidence intervals. Confidence intervals allow one to estimate important population parameters such as population mean, population proportion, population standard deviation, etc.
Determine the probability that sample mean will be greater than M=510. In symbols, what is p(M>510)? Determine the probability that sample mean will be greater than M=520.
Based on the information provided, you are to complete the appropriate 2014 individual tax form and any supporting schedules/forms for the Grants.
Find the answers to parts (a) and (b) in the special case when the interarrival times are exponentially distributed with mean 1/A.
Milligrams with standard devation s=1.0 milligram. construct a 95% confidence interval for the difference between the mean nicotine content of two brands of cigarettes.
Which of the following conditions must be met to conduct a test for the difference in two sample means? Suppose we test the difference between two proportions at the 0.05 level of significance. If the computed z is -1.07, what is our decision?
At a local supermarket receiving dock, the number of truck arrivals per day is recorded for 100 days. Estimate the mean from the sample.
Find the quotient and remainder when x^7 + x^4 + x + 1 is divided by x^3 + x^2 + 1 over mod 2. Please show the detailed working along with explanations as needed.
What is the difference between discrete and continuous variables? Under what circumstances would each be applicable? The Acme School of Locksmithing has been accredited for the past 15 years. Discuss how this information might be interpreted as a
If x is the sample mean time for a random sample of n = 9 students, where is the x distribution centered, and how much does it spread out about the center (as described by its standard deviation)?
If you were to accept the null hypothesis, even though the null hypothesis was false, what type of error would you have commited?
the famous urn contains 11 red beads and 8 black beads. if 7 beads are drawn without replacement what is the
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