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Question: 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 vitamins 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 HIVand the study date) for the analysis, y=CD4 count. Y=302 +15.1 supplements- 18.6 duration of HIV.
A) What is the expected CD4 count for a patient taking supplements who has had HIV for 2.5 years.
B) What is the expected CD4 count for a patient not taking supplement who was diagnosed with HIV at study enrollment?
C) What is the expected CD4 count for a patient not taking supplements who has had HIV for 2.5 years.
What is the expected number of audits for the 6 randomly selected individuals? What is the standard deviation for the number of audits for the 6 randomly selected individuals?
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
Linda would like to maintain a 90% service level. what safety stock level do you recommend for BX-5?
Mathml equation = $32,000 and mathml equation = $3000. If 100 teachers are randomly selected, find the probability that their mean salary is greater than $32,500.
John Rengel is the Quality Assurance Supervisor for Vino Supremo Vinyards. He knows that 10 percent of each box of corks is undersized.
If he were to conduct a second study to reduce the maximum error of estimate to 6, about how many hard drives should he include in his new sample?
The breaking strengths of cables produced by a certain manufacturer have a mean, of 1925 pounds, and a standard deviation of 65 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength.
Distributed with mean 4.6 minutes and standard deviation 1.4 minutes. If there are 75 students in class, determine probability the professor requires more than 6 hours to mark all of the midterms?
Explain why the polls that are so frequently quoted during early returns on Election Day TV coverage are an example of cluster sampling.
As people use the toothpaste, the amount remaining in any tube is random. Assume the amount left in the ube follows a uniform distribution. How much toothpaste would you expect to be remaining in the tube.
Because of a recent incident in which a number of people became ill after eating undercooked hamburger meat, intensive interest has centered around the cooking time for hamburger patties.
A foreman for a firm admits that on 10% of his shifts he forgets to shut off the machine. This causes the machine to overheat and the probability that a defective mold will be produced during the early morning run increases from 2% to 20%.
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