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Question
Many studies have been conducted on the effects of having a pet on the response to medical problems and on mental health. But doctors in Berlin were interested in the effects of having a pet bird on lung cancer. (I assume they were wondering if birds might cause air pollution that could lead to lung cancer.) They asked 239 patients with lung cancer and 429 controls without lung cancer whether they had a pet bird. Ninety eight of the 239 patients did have a bird, while 101 of the 429 controls had a bird. (That strikes me as a very high percentage of bird owners, but those are the data.)We really do need a measure of effect size in this example. What would be an appropriate one?
a) the mean difference between bird owners and bird nonowners
b) the squared correlation between ownership and cancer
c) the odds ratio
d) relative risk
Answer
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Related questions
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1 2 3 4
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d) The upper hinge
e) The lower hinge
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18 is the symbol commonly used for the
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b) 10
c) 16
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d) 0.
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17 In the equation = 12.6 X + 5
a) a difference of one unit in X will lead to a 5 point difference in the prediction.
b) will decrease as X increases.
c) the correlation is certain to be significant.
d) a difference of one unit in X will lead to a 12.6 point difference in the prediction.
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b) minimizes each squared error of prediction.
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d) hits the most points as it goes through the scatterplot.