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A study published in the British Medical Journal (January 2012) sought to determine whether exercise would help extend the lives of patients who have had non fatal heart attacks. A sample of 800 patients with heart failure was recruited; 390 received exercise training and 410 did not. There were 78 deaths among the exercise group and 114 among those who did not exercise. Can researchers infer at the 5% significance level that exercise training reduces the death rate of persons who have previously suffered heart attacks? Solve manually (show all work) and by Mega Stat only. Indicate your hypotheses, decision rule, statistical decision and management conclusion using the critical value and then find the p-value and state your decision rule, statistical decision and management conclusion using this method.
To find out the alternate hypotheses also critical value. A truck dealer claims where a new model will give trouble free service for at least 15,000 miles.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Compute the proper measure of association of smoking and lung cancer.
The Minneapolis Tribune ran an article on gender differences in shopping behavior. When 400 women were asked to respond to the question "Where I shop is influenced by which store has a greater variety," 60% answered "Yes.
Support colour-coding on packaged food to indicate healthier options
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. Check the normality assumption.
illustrate briefly how an experimental study is conducted. What is the difference between the two types of variables used.
Assume if random samples of size n = 9 are selected can we say anything about the distribution of sample means.
Assume that in a hypothesis test with null hypothesis H 0 : μ = 14.0 at a = 0.05, that a value of 13.0 for the sample mean results in the null hypothesis not being rejected. That corresponds to a confidence interval result of:
Hours worked is important predictor of amount of sales.
Mention the critical value of test statistic (Or give the p-value of the test.)
What is the probability that in a sample of 10 pieces: 5 or more will be defective?
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