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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?
Provide two examples for each source of measurement error and include how each example might likely influence research results.
Search the library for a scholarly journal article of a study that presents the results using correlation analysis. Summarize the article, explain how the correlation was used, and the value of correlation analysis.
A normal population has a mean of 60 and a standard deviation of 3. You select a sample of 36. Compute the probability the sample mean is (Round z values to 2 decimal places and final answers to 4 decimal places):
Define the decision rule. Calculate the value of the test statistic.
Estimate the values using multiple regression models. An air conditioning as well as heating repair firm conducted a study to determine if the outside temperature, Illustrate the forecasted monthly electric bill.
An experiment was conducted to determine the effects of three different pesticides (P1,P2,P3) on the yield of three different varieties of citrus tree (V1,V2,V3).
Find the probability of an untrained dog performing as well as Maggie. Is it unusual for an untrained dog to do as well as Maggie?
Compute a seasonalized or adjusted sales forecast.
Illustrate a quantitative assessment of what our charts would look like and what these new targets would do to our operations.
The t-statistics that was obtained in the study of 400 subjects was t=20, rejecting the null hypothesis and showing that the drug has a beneficial effect. Why was management upset?
The DPMO for process is 860. Find the approximate Six Sigma level of the process?
Construct a 98% prediction interval for the selling price of a 4l- year old house having 4500 square feet, 13 rooms, and an attached garage.
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