Biostatistics Quiz - Statistics.com: Data Science, Analytics & Statistics Courses

The probability that a 50-year old man will be alive at 60 years is 0.83 and the probability that a 45-year old woman will be alive at age 55 years is 0.87. What is the approximate probability that a man who is 50 years old and his wife who is 45 years old will be both alive 10 years hence, assuming independence?

a. 1.7

b. 0.72

c. 0.85

d. Cannot be determined due to different time periods

The probability that a 50-year old man will be alive at 60 years is 0.83 and the probability that a 50-year old woman will be alive at age 60 years is 0.85. What is the approximate probability that, between a man who is 50 years old and his wife who is 50 years old, at least one will be alive 10 years hence, assuming independence?

a. 1.68

b. 0.71

c. 0.84

d. 0.97

200 women at risk of ovarian cancer are given a series of tests and a diagnosis is ultimately reached about whether they have the cancer or not. Of interest is the performance of one of the tests – an ultrasound scan. Consider the 2 x 2 table shown here (linked from icon lower left). Sensitivity (which is 0.21) is:

a. The overall percent of women in the study who have ovarian cancer.

b. The percent of women with cancer who test abnormal on the scan

c. The percent of women who test abnormal on the scan who do have the cancer.

d. The percent of women without cancer who test abnormal on the scan

One percent of women of age 40-44 years participating in a routine screening are found to have breast cancer. Eighty percent of women with breast cancer will get positive mammography, 9.6% of women without breast cancer will also get positive mammography. A woman in this age group had a positive mammography in a routine screening. What is the probability that she actually has breast cancer?

First Choice

Second Choice

Third Choice

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