1) A study to determine the sensitivity and specificity of a new test for macula

Question

1) A study to determine the sensitivity and specificity of a new test for macular degeneration is conducted on 2430 people. Macular degeneration occurs at a rate of 16.72%. Your sample has the same prevalence of macular degeneration. You find that 377 people with macular degeneration tested positive with the new test. You also have a total of 561 positive test results in your study. CALCULATE THE SENSITIVITY of this test.

Question 1 options:

A) 16.71%

B) 90.91%

C) 67.20%

D) 98.45%

E) 92.86%

Question 2) A study to determine the sensitivity and specificity of a new test for celiac disease is conducted on 7642 people. Studies have shown that celiac disease occurs at a rate of 1.32%. Your sample has the same prevalence of celiac disease. You find that 99 people with celiac disease tested positive with the new test. You also have a total of 7495 negative test results in your study. CALCULATE THE SENSITIVITY of this test.

Question 2 options:

A) 99.97%

B) 98.02%

C) 68.71%

D) 99.36%

E) 67.35%

Question 3) A study to determine the sensitivity and specificity of a new test for diabetes is conducted on 576 people. The national prevalence of diabetes in adults is 9.7%. Your sample has the same prevalence of diabetes. You find that 51 people with diabetes tested positive with the new test. You also have a total of 83 positive test results in your study. CALCULATE THE SENSITIVITY of this test.

Question 3 options:

A) 99%98

B) 93.85%

C) 61.45%

D) 67.47%

E) 91.07%

Question 4) A study to determine the sensitivity and specificity of a new test for macular degeneration is conducted on 2430 people. Macular degeneration occurs at a rate of 16.72%. Your sample has the same prevalence of macular degeneration. You find that 377 people with macular degeneration tested positive with the new test. You also have a total of 561 positive test results in your study. CALCULATE THE SPECIFICITY of this test.

Question 4 options:

A) 98.45%

B) 67.20%

C) 90.91%

D) 92.86%

E) 83.29%

Explanation / Answer

1)

SENSITIVITY of this test =P(test postiive|true positive)=377/(2430*16.7%)=92.86%

option E

2)SENSITIVITY of this test =99/(1.32%*7642)=98.02%

opion B

3)

SENSITIVITY of this test =51/(9.7%*576)=91.07%

option E

4)

SPECIFICITY of this test =P(test negative|true negative)

=(2430(1-0.1672)-(561-377))/(2430*(1-0.1672)) =90.91%

option C

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