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Below are the Intervals from primary AIDS diagnosis until death for a sample of 12 hemophiliac patients at most 40 years of age at HIV seroconversion.
ID Survival (months) 1 2 2 3 3 6 4 6 5 7 6 10 7 15 8 15 9 16 10 27 11 30 12 32
(a) Use the Kaplan-Meier (product-limit) method to estimate the survival function.
(b) Construct a survival curve based on the product-limit estimate.
(c) Estimate the median survival time
Calculate x2, s2 and s for the expense data. Show that the two different formulas for calculating s2 give the same result.
A population with u=73 and o=9 is transformed into a new population with u=10 and o=2. What is the new value for each of the following scores in the population?
According to the study, the mean age of a self-employed individual is 46.6 years with a standard deviation of 10.8 years.
Ten students were sampled at random from a student population. Each was asked how many courses he or she was planning on studying in the upcoming year. The following is a list of the reported data values: 1, 2, 2, 3, 4, 5, 5, 5, 5, 6 What is the vari..
Find out if a difference between two response sets is significant. I asked 98 boys what modalities they thought were attractive to girls. 35 said athletes; 25 said tough guys. The rest endorsed other modalities at lesser rates.
Assume that a 95% confidence interval estimate of the new annual starting salary is desired. How large a sample should be taken if we do not want to exceed $500? What do you know?
A study to see how well marital dissolution was predicted by the personality scores of husbands and wives was published in the Journal of Personality and Social Psychology.
If a manufacturer charges 'p' dollars each for shirts, then he expects to sell 2000-100p shirts per week. What polynomial represents the total revenue expected for a week?
The mean time for these workers is = 39.8 seconds and the -value less than 0.0001. It is appropriate to conclude which of the following?
Determine the mean and standard deviation of following probability distribution.
What type of damage could occur if you grabbed a door frame with your left arm stepped with your right leg the leg shoots out from under you and you bounce down hitting the edge.
Two teams of workers assemble automobile engines at a manufacturing plant in Michigan. Quality control personnel inspect a random sample of the teams assemblies and judge
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