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1) In order to fill out the “diagnostic matrix” below, we apply the percentage of people diagnosed with breast cancer via the screening test to give the number with and without breast cancer (85 and 9915). The sensitivity percentage is used to find those with breast cancer and a positive or negative screening. The specificity percentage is used to find those without breast cancer and a positive or negative screening.
Breast Cancer No Breast Cancer Total
Positive Screening 81 496 577
Negative Screening 4 9419 9423
Total 85 9915 10000...
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