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Suppose we assume that the incidence of MI is .005 per year among participants who actually take placebo and that aspirin prevents 20% of MIs (i.e. relative risk = p1/p2=0.8) We also assume that the duration of the study is 5 years and that the dropout rate in the aspirin group=10% and the drop in rate in the placebo group=5%. How many participants need to be enrolled in each group to achieve 80% power using a two-sided test with significance level =.05
How many participants need to be enrolled in each group to have a 90% chance of detecting a significant difference using a two sided test with α =0.05 if compliance is perfect?
What is the value of the population mean? What is the best estimate of this value?
Consider following data on exam scores of 10 randomly selected students: Compute 3rd quartile of the exam scores.
A regional director responsible for business development in the state of pennsylvania is cocerned about the number of small business failures. If the mean of small businsses failures per month is 10,
Construct a 90% confidence interval on the difference in fraction nonconforming between the two processes."
The heights of adults in one town have a mean of 66.3 inches and a standard deviation of 3.3 inches. What can you conclude from Chebychev's theorem about the percentage of adults in the town whose heights are between 59.7 and 72.9 inches..
Give an example of a repeated measures analysis of variance (ANOVA)--no examples of therapy or temperature.
Assume that 13 % of the population of the U.S. is left-handed. If a random sample of 180 people from the U.S. is chosen, approximate the probability that fewer than 26 are left-handed.
Scores on an endurance test for cardiac patients are normally distributed with mean = 182 and standard deviation = 24.
Critically discuss the auto-covariance function of a stationary time series and its basic properties.
The accounting department at Weston Materials, Inc., national manufacturer of unattached garages, reports that it takes two construction workers mean of 32 hours and standard deviation of 2 hours to erect the Red Barn model.
Determine the value of population mean? What is the best evaluate of this value?
We are 95% confident that the proportion of non sell-able items for Whole Fruits is anywhere between 6.4% and 15.6% HIGHER than the proportion of non sell-able items for Green Grocer.
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