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A news article on the Reuters Health website reported that:
A study of over 1200 people over age 65 showed that the "owls" - those who tend to go to sleep after 11 p.m. and rise after 8 a.m. - tend to be as healthy and intelligent as "larks" - those who go to bed before 11 p.m. and rise before 8 a.m. - according to a report in the December 19/26 issue of the British Medical Journal . The researchers found that owls tend to have higher average income than the larks.
a. Is this an observational study or a randomized experiment?
b. What are the explanatory and response variables?
As reported by Runner's World magazine, the times of the finishers in the New York City 10-km run are normally distributed with a mean of 61 minutes and a standard deviation of 9 minutes. Let X be the finishing time for a finisher in the New York ..
Commuting to work: On Monday, Roger drove to work in 45 minutes(.75h). On Tuesday, he averaged 12 miles per hour more, and it took him 9 minutes (.15h) less to get to work. How far does he travel to work?
Over the last ?fty years, mortgage rates have ?uctuated from a high of around $18 1/2 % in the early 1980s to a low of around $4 1/2 % last fall. What would the monthly payments be on a thirty-year $100,000 mortgage at each rate? What would the to..
During the first part of a trip, a canoeist travels 98 miles at a certain speed. the canoeist travels 44 miles on the second part of the trip at a speed 5 mph slower. the total time for the trip is 3 hours. what was the speed on each part of the t..
The triangle (15,34, 35; 252) is the smallest acute Heron triangle indecomposable into two Pythagorean triangles. Realize it as a lattice triangle, with one vertex at the origin.
Assuming both retire at 70, and that the interest rate both get on their investments is 10% (compounded annually) who has the most money in their account at age 70? Explain why you pick the answer you pick.
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how long does it take to commute from home to work? it depends on several factors including route traffic and time of
Use the Gauss-Jordan Method of Computing Inverses to find the inverse and then to solve the system of linear equations.
Information from the American Institute of Insurance indicates the mean amount of life insurance per household in the United States is $110,000. This distribution follows the normal distribution with a standard deviation of $40,000.
Given that a widget was produced by the new machine, what is the probability it is not defective?
Upstream, downstream: Junior's boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?
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