A study was conducted to evaluate new test for human papilloma virus (HPV). One hundred eighty women with HPV were compared to 600 women who did not have HPV. A total of 200 women tested positive using the new test, 140 of whom really did have HPV.

You will be graded on calculations (including completion of the 2x2 table as shown in class and showing your work for calculation, your interpretations, and your answers to the other questions. Your interpretations must be specific and will be graded on accuracy, correct use of scientific terminology, professional writing style, grammar, and spelling.

1) Complete the contingency table . (2 points)

2) How many women are in each of the following categories? (1 point)

True positives:

False positives:

True negatives:

False negatives:

3) Calculate and interpret the sensitivity of the new screening test. (1.5 points)

4) Calculate and interpret the specificity of the new screening test. (1.5 points)

5) Calculate and interpret the positive predictive value of the new screening test. (1.5 points)

6) Calculate and interpret the negative predictive value of the new screening test. (1.5 points)

7) Do you think that it would be better to use this new screening test for HPV or an older screening test with 90% sensitivity and 80% specificity. The older screening test is more expensive. Write 100-125 words supporting your position. (1 point)