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Question: The drug AZT was the first drug that seemed effective in delaying the onset of AIDS in people infected with HIV. Evidence for AZT's effectiveness came from a large double blind, randomized comparative experiment. The subjects were 1300 HIV-positive volunteers who had not yet developed AIDS. The study assigned 435 of the subjects at random to take 500 milligrams of AZT each day and another 435 to take a placebo. (The others were assigned to a higher dose of AZT, but we will compare only the first two groups.) At the end of the study, 42 of the placebo subjects and 11 of the AZT subjects had developed AIDS.
(a) What is the relative risk for developing AIDS for the AZT group compared with the placebo group? Please use 4 decimal places.
What is the probability that a randomly chosen sample of five contains at least one defective board?
The report costs Paula $ 15 to produce, but Paula is able to sell reports for $ 350 each. Of course, any reports not sold by the end of the week have no value. How many reports should Paula produce each week?
The Jackson Corporation concludes that the rate at which a seller's quantity supplied changes with respect to price is given by the marginal supply function, Find the supply function if it is known that the seller will sell 121 units of the product..
The quantity demanded each month of Russo Espresso Makers is 250 when the unit price is $111.00. The quantity demanded each month is 1000 when the unit price is $81.00.
A landscape architect wishes to enclose a rectangular garden on one side by a brick wall costing $30/ft and on the other three sides by a metal fence costing $20/ft. If the area of the garden is 1,500 ft2, find the dimensions of the garden that mi..
p A boat takes 6 hours to go downstream and upstream a certain distance. It takes 4 hours to travel twice the distance downstream. Which of the following is the ratio of the speed of the boat in still water to the speed of the river? Indicate the cor..
a. Find the amount of salt in the tank at any time t. b. Find the time at which the mixture in the tank contains 0.5 kg of salt.
The formula b=29a is used in New England to estimate the minimum furnace output, b, in BTUs, for a modern house with a square feet of flooring.
For an electric circuit, let V=cos 2pi(t) model the electromotive force in volts at t seconds. Find smallest positive value of t where 0
One common type of calculation that is made frequently out there in the real world is a "fixed and variable cost problem" - what I call a Garfield problem because it's a "lump and per" scenario. What is your total cost per month? Approximately how ..
The ratio of the sides of the square are 2:5. Calculate the area of the bigger one if the area of the small one is 196 cm^2
First for the matrix A which has column space equal to the span of u and v. That is, find A = [u|v]
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