We know that the proportion of women who have been diagnosed with breast cancer in the...
We know that the proportion of women who have been diagnosed with breast cancer in the general population is 0.013 or 1.3%. We think that a meaningful difference in proportion of women who have ever been diagnosed with breast cancer is |p0-p1| = 0.02 or 2% difference. for all cal. let alpha = 0.05
A. What sample size is needed to have 90% poor to detect this difference assuming that we use a two sided test.
B. If we have a sample size of 280 subjects, how much power does the test have.
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We know that the proportion of women who have been diagnosed
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BACKGROUND & METHODS
The relationship between stress and breast cancer has been
examined in many epidemiological studies, the results of which have
yielded mixed results. One reason for these differences is the use
of different measures of stress. For example, death of a spouse or
close relative is a major acute stressor, whereas stress
experienced in daily life is more moderate and chronic in nature.
As these different types of stress likely have different
physiological and psychological impacts, the observed...
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Question 1 4 pts A method currently used by doctors to screen women for possible breast cancer fails to detect cancer in 15% of the women who actually have the disease. A new method has been developed that researchers hope will be able to detect cancer more accurately. A random sample of 70 women known to have breast cancer were screened using the new method. Of these, the new method failed to detect cancer in 8. Calculate the test statistic...
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BACKGROUND & METHODS
The relationship between stress and breast cancer has been
examined in many epidemiological studies, the results of which have
yielded mixed results. One reason for these differences is the use
of different measures of stress. For example, death of a spouse or
close relative is a major acute stressor, whereas stress
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As these different types of stress likely have different
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