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Question: Treating prostate disease A large study used records from Canada's national health care system to compare the effectiveness of two ways to treat prostate disease. The two treatments are traditional surgery and a new method that does not require surgery. The records described many patients whose doctors had chosen each method. The study found that patients treated by the new method were significantly more likely to die within 8 years.38
(a) Further study of the data showed that this conclusion was wrong. The extra deaths among patients who got the new method could be explained by other variables. What other variables might be confounded with a doctor's choice of surgical or nonsurgical treatment?
(b) You have 300 prostate patients who are willing to serve as subjects in an experiment to compare the two methods. Describe a completely randomized design for this experiment. Write a few sentences describing how you would implement your design.
The width of a 95% confidence interval for µ is 10 units.- If everything else stays the same, how wide would a 90% confidence interval be for µ?
complete problem 13 on page 54 using spss. copy and paste your spss output for 13a and 13b to the word document. for
Mutual funds are classified as large-cap funds, medium cap funds, or small-cap funds, depending ont eh capitalizaiton of the companies in the fund.
1. Determine the margin of error for a confidence interval estimate for the population mean of a normal distribution given the following information:
What extremely important characteristic of the data set is not considered in the hypothesis test?
suppose the u.s. president wants an estimate of the proportion of the population who support his current policy toward
In the inspection of a fabric produced in continuous rolls, the number of imperfections per yard is a random variable having the Poisson distribution with λ = 0.25. Find the probability that 2 yards of the fabric will have at most one imperfectio..
For all subsequent parts state the null and alternative hypothesis, write down the test statistics and their degrees of freedom, calculate the test statistics, find the p-values and give interpretations.
a. How many levels of factor A were used in the study? b. How many levels of factor B were used in the study? c. What are the df values for the F-ratio evaluating the interaction?
A rare nonlethal disease (ND) that develops during adolescence is believed to be associated with a certain recessive genotype (aa) at a certain locus.
Sales are above 671,000 copies, and 10% of the time, sales are above 712,000 copies. Find the mean and the variance of annual sales.
How large a sample should she take to estimate the percentage with a margin of error of no more than 4%, with 90% confidence?
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