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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.
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
National data show that, on average, college freshman spend 7.5 hours a week going to parties. President DeRosa doesn't believe that these figures apply at his school; he thinks freshman at his school party less.
What is the probability of getting seven heads in a sample of twenty coin flips? Is this significantly different from the population in which P = 0.50 if the alpha is 0.05?
1.a statistics instructor wants to know which route will get her to school the fastest. each day from october 2 to
the level of significance is the a. same as the p-value b. maximum allowable probability of type i error c. same as the
a researcher hypothesizes that the variation in the amount of money spent on business dinners is greater than the
Explain or interpret the regression coefficient of N, the t-values, and the coefficient of determination of this equation. How is it possible that more hot chocolate is sold when there are fewer people at the beach?
a distribution with a mean of micro 38 and a standard deviation of s 20 is being transformed into a standardized
Test to compare the proportions of HBV infection between the four groups: physicians with frequent exposure, physicians with infrequent exposure, nurses with frequent exposure, and nurses with infrequent exposure. State clearly your null and alter..
a bank manager wishes to provide prompt service for customers at the banks drive-up window. the bank currently can
Write a statistical null and alternate hypothesis and draw a conclusion about the relative safety of the three types of seats.
The Graduate Management Admission Council, who administers the test, claims that the mean total score is 529. Suppose a random sample of 8 students took the test, and their scores are given below. 699, 560, 414, 570, 521, 663, 727, 413 Use α = .05..
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