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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.
John, a medical practitioner at a private medical facility, is discussing the problem that one of his patients, Tom, says he has been having with the medication that the doctor has prescribed.
explain why we use the notation p lt .05 in the formal test of the hypothesis when there is a significant difference
Draw a bar graph for the data on the first five stocks in given problem. Is any one of the three kinds of plot more appropriate than the others for these data? If so, why?
In the Health ABC Study, 595 subjects owned a pet and 1939 subjects did not.23 Among the pet owners, there were 285 women; 1024 of the non-pet owners were women.
a) In the context of the problem, which of the following interpretations is correct, if any? A. We're 95% confident that the mean length of eggs for the New Zealand bird population is between 38 mm and 53 mm. B. 95% of all birds in New Zealand have e..
The iron content of slag can be estimated magnetically, or measured chemi cally. The magnetic method is quicker and easier, but the chemical method is more precise. Five slag samples are measured both ways.
Normally distributed with a mean of 113 grams and a standard deviation of 5.4 grams. Find the probability that if 7 bags are randomly selected, their mean weight exceeds 114 grams.
an adiabatic heat exchanger is used to heat cold water at 8 deg c entering at a rate of 3kgs by hot air at 150 deg c
Given the following data on hotel check-ins for a 6-month period:
Formulate a payoff table that specifies the contribution to profit (in dollars) from the sale of the tennis shoes by this department store chain for each possible purchase decision.
In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents
the fawtry contruction company has built a condo for mr. herr a. cane on the outer banks of north carolina having a
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