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A study published in the Journal of the American Medical Association examined people to see if they showed any signs of IRS (insulin resistance syndrome) involving major risk factors for Type 2 diabetes and heart disease. Among 102 subjects who consumed dairy products more than 35 times per week, 24 were identified with IRS. In comparison, IRS was identified in 85 of 190 individuals with the lowest dairy consumption, fewer than 10 times per week.
a) Is this strong evidence that IRS risk is different in people who frequently consume dairy products than in those who do not?
b) Does this prove that diary consumption influences the development of IRS? Explain.
What is the correlation between student cumulative GPA and the numbers of hours spent on school work each week? Be sure to include the computations.
The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months. What is the probability that a randomly selected terminal will last more than 5 years?
Construct a payoff table for the president's R&D investment problem.
The IQ scores of 30 children from under-privileged households, were measured before and a year after, a program of nutritional supplementation was instigated at a primary school.
What critical value should the company officials use to determine the rejection region?
A sample of 4 trucks is randomly selected. What is the probability that 2 of those tested have defective brakes.
Suppose you are given a grant to run a controlled experiment. Explain how you would structure the experiment in order to estimate the casual effect of hours on sat.
Assuming the weight of cereal is normally distributed, determine the likelihood that a package will contain more than 12.2 ounces. Calculate using megastat.
quality control is an important issue at acme company which manufactures light bulbs. in order to conduct testing of
In a simple random sample of 40 connectors from a very large production run, the mean time until failure was found to be 35.5 seconds. Construct and interpret the 99% confi- dence interval for µ 5 the mean time until failure for all of the conne..
BMI is measured in a sample of patients, with a mean of 31.7 and a standard deviation of 5.9. How many subjects would be needed to ensure that a 95% confidence interval estimate of BMI had a margin of error not exceeding 2 units?
Your new project is coming in over budget and requires a cost change through the cost change control system. The cost variance was projected using which of the following tools and techniques?
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