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The standard screening test for Down's Syndrome is based on combination of maternal age and the level of serum alpha-fetoprotein. Using this test 80% of Down's syndrome cases can be identified, while 5 % of normals are detected as positive.
What is the sensitivity and specificity of the test?
Suppose that 1 out of 500 infant's are born with Down's Syndrome.
200 people were surveyed and asked to rate mayor Michael Bloombergs effectiveness towards education. The rate scale is 1 (lowest) to 10 (highest). Mayor Bloomberg's average rating was 7.50, with a standard deviation of 2
Leggo's pesto is make from a recipe brought to America by an immigrant ancestor the present generation refers to as Bisnonna Maria.
Prepare the confidence interval of 95% for the welders' proportion that graduated in the school of welding.
In studying the performance of the comapany's stock investments over the past year, the research manager of a mutual fund company finds that only 43% of the stocks returned more than the rate that had been expected at the beginning of the year.
What is the probability that a random person has an IQ between 85 and 115? Find the 90th percentile of the IQ distribution.
Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol.
What is the probability of drawing two diamonds after discarding 5 and 7.
If historical time series data is very limited, what type of forecasting approach would be useful.
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
What would be a good example of a null and alternative hypotheses for a decision relevant in life? What Type I and Type II errors could occur with your decision-making process?
Suppose that monthly rental rates for unfurnished one-bedroom apartment in Ann Arbor, Michigan, are approximately normal in distribution, with a mean of $750 and a standard deviation of $150.
Critically discuss why the dowload is a continous numerical varaible and critically discuss why the download time is a ratio scaled variable.
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