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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?
The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
Now assume institutional cache is used. Hit rate for cache is 0.6. Determine the total average response time.
If we assume that the errors made by rounding off are iid and have a uniform distribution over the interval ( - ~, ~), compute approximately the probability that the sum of the integers is within two units of the true sum.
She knows that 60% of the minerals have mass less than a certain amount m, and needs to select a random sample of n = 16 specimens for an experiment. With what probability will their average mass be less than the same amount m? (Hint: Calculate th..
A property of concern for any food company that uses a high-speed carton-filling machine to package juice is the weight of the food product in the individual cartons.
The mean income of a group of sample observations is $500; the standard deviation is $40. According to Chebyshev's theorem, at least what percent of the incomes will lie between $400 and $600?
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
In a sample of 1,000 representing a survey from the entire population, 650 people were from Laketown, and the rest of the people were from River City.
Suppose you were to cut up the directory and pull out one listing at random to contact.
Probability distribution described by the following density curve and The expected value of the sum of the weights of the two oranges, in pounds
At a = 0.05, can you reject claim that at least 52% of adults are more probable to purchase a product when there are free samples?
If measurements are made over span of 9 months, and results are averaged, find out the probability that neighbourhood is considered unsafe?
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