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In the table in the textbook on page 511 you will find survival times in months since diagnosis for 10 AIDS patients suffering from concomitant esophageal candidiasis, an infection due to Candida yeast, and cytomegalovirus, a herpes infection that can cause serious illness. Censored observations are denoted by a plus sign.
a. How many deaths were observed in this sample of patients?
b. Use the product-limit method to estimate the survival function S(t).
c. What is S(1), the estimated probability of survival at one month? What is the estimated probability at 5 months? At 6 months?
d. Construct a survival curve (do not submit) based on the product-limit estimate.
Perform a sensitivity analysis on the optimal decision and summarize your findings. In response to which model inputs is the expected profit value most sensitive?
what is the probability that the sample will indicate that Smith will win the election?- what is the probability that the sample will indicate a dead heat (fifty-fifty)?
The data file ex0218 contains the beak depths (in mm) of all 751 finches captured by Peter and Rosemary Grant in 1976 and all 89 finches captured in 1978 (as described in Section 2.1.1). Use a statistical computer program for parts a-d:
given the independent random variables x and y with respective probability mass functionspx 0 12px2 12py1 16py2
If Belson Electronics's new converter produces less than the 110 volts of their old product, they must redesign it. A sample of 303 converters generated a mean of 107.2 volts, with a standard deviation of 47.3 volts. Set Alpha at 5 percent.
A beverage company is trying to ?nd out the distribution of the breaking strength of their glass bottles. Fifty bottles are selected at random and tested for breaking strength, with the following results (in pounds per square inch):
You have been asked to develop a study of the effects of watching Sesame Street on childrens' gender role orientations, intelligence, or sociability.
Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms.
in order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is
Coke cans: n=36, mean of values in sample = 12.19 oz., s= 0.11 oz. Test the claim that the mean equals 12 oz. Use a significance level of alpha = 0.02.
for each of the following two problems analyze the data given in the related data le. write up your results in the
You want to determine if the sample result gives good evidence that the true amount of the compound is not equal to 2 gms. Carry out the test, find the P-value, and state your conclusion.
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