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Science News (February 25, 1995, p. 124) reported a study of 232 people aged 55 or over who had had heart surgery. The patients were asked whether or not their religious beliefs give them feelings of strength and comfort and whether or not they regularly participate in social activities. Of those who said yes to both, about 1 in 50 died within 6 months after their operation.
Of those who said no to both, about 1 in 5 died within 6 months after their operation. What is the relative risk of death (within 6 months) for the two groups? Write your answer in a sentence or two that would be understood by someone with no training in statistics.
(a) Define the two populations and then formulate the appropriate null and alternative hypothesis for the test. (b) Conduct a hypothesis test at the 10% level of significance to test the null hypothesis. (c) What statistical and management conclusion..
Given 5,000 light bulbs from an outside supplier. If past performance data indicates that these have been 3% defective, and a random sample of 40 parts are drawn from the shipment what is the probability that you will find more than 2 defective pa..
the time to failure in years for a product has the following pdfft 200t 103 for tgt0a derive the reliability function
What is the decision rule and What is your decision regarding H0 - The value of the test statistic is . (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
An auditor for Health Maintenance Service of Georgia reports 40% of policyholders 55 years or older submit a claim during the year. Fifteen policyholders are randomly selected for company records.
What do we mean by confidence intervals - provide an example that illustrates your answer. Suppose we were to apply 95% and 99% confidence to your study results.. how might your result differ and why?
Which is more likely to occur-more than 60% correct identifications in the sample of 200 or more than 55% correct identifications in a sample of 1,000? Explain.
betsy is interested in predicting how many 75-year-olds will develop alzheimers disease and is using level of education
q1. a high volume production process produces on average 3.4 defective parts per hour and the number of defects in an
Collecting data on traffic accident fatalities, the National Highway Traffic Safety Administration has found that 58.7 of the victims have 0.0% blood alcohol content (BAC); 5.8% of the victims have from 0.01 0.07 percent BAC;
the manager of a grocery store wants to determine what proportion of people who enter his store are his regular
Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in a popper.
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