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A study is conducted in patients with hiv. the primary outcome is cd4 cell count which is a measure of the stage of the disease. lower cd4 counts are associated with more advanced disease. the investigators are interested in the association between vitamin and mineral supplements and cd4 count. a multiple regression analysis is performed relating cd4 count to use of supplements (coded as 1=yes, 0=no) and to duration of hiv, in years (i.e., the number of years between the diagnosis of hiv and the study date). for the analysis, y=cd4 count.y=302 +15.1 suppliments -18.6 duration of HIV what is expected CD4 count for a paient taking supplements who has had HIV for 2.5 years. What is he expected CD4 count for a patient not taking supplements who was diagnosed with HIV at study enrolment. What is the expected CD4 count for a patient not taking supplements who had HIV for 2.5 years.
Normal Probability: Diameter of Grapefruits. The diameters of grapefruits in a certain orchard are normally distributed with a mean of 5.44 inches and a standard deviation of 0.41 inches.
about 6 percent of the population are hopelessly romantic, if two are randomly selected, what are the probability that both are hopelessly ramantic.
what is the probability that the mean breaking strength of the 5 untreated specimens exceeds 50 pounds? what is the probability of the mean breaking strength of the 5 treated specimens exceeds 50 pounds?
from company B, 550 stereos are purchased and 4% are found to be defective. given that a stereo is defective, find the probability that it came from company A?
Suppose a diver leaps from the edge of an 80foot cliff. His initial upwards velocity is 8 feet per second. When will he hit the water?
Given a rational function, identify a method which can be used to determine if there is a vertical asymptote.
The region bounded by the curves x = y^2 +16 and x = -y^2 + 24 is rotated around the y-axis. Find the volume of the resulting solid.
for a whole life insurance policy issued to a life aged exactly 30 has an increasing death benefit sum insuredface
an asian restaurant sells fusion food with the choice of ketchup mustard and relish. one day they serve 256 customers
the following question is based around the three trigonometric identitiescos2x sinx 1 1 tan2x sec2x 1 cot2x
Find the value of "a" that makes the following function differentiable at x = 2.
Now, if you measured the tail length in centimeters instead of millimeters, what would be the slope of the regression line? (There are 10 millimeters in a centimeter.)
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