Concept explainers
The value of mammography as a screening test for breast cancer has been controversial, particularly among young women. A study was recently performed looking at the rate of false positives for repeated screening mammograms among approximately 10,000 women who were members of Harvard Pilgrim Health Care, a large health-maintenance organization in New England [9].
The study reported that of a total of 1996 tests given to 40- to 49-year-old women, 156 yielded false-positive results.
Some physicians feel a mammogram is not cost effective unless one can be reasonably certain (e.g., 95% certain) that the false-positive rate is less than 10%. Can you address this issue based on the preceding data? (Hint: Use a CI approach.)
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Fundamentals of Biostatistics
- To combat antibiatic resistance, the Quality Consortium recommends a throat swab to confirm strep throat before a physician prescribes antibiotics to children under age 5. Nationally, 40 percent of children under 5 who received antibiotics did not have a throat swab. The Colorado Department of health took a random sample of 88children under the age of 5who received antibiotics for throat infections and found that 30 did not have a throat swab. At a=.05, is this a statistically significant reduction over last years national rate of 40 percent?arrow_forwardIf all participants in a repeated measures research study show roughly the same difference between treatments, then the data will produce a statistically significant value for the t statistic. True or falsearrow_forwardAn article reports that blue-eyed people earn less than brown-eyed people, with the average blue-eyed salary at $35,000, the average brown-eyed salary at $37,000, and the p-value at 0.45. Based on that reported p-value and using the common definition of statistical significance, which of the following is true?arrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill