Quiz 6.docx

# Quiz 6.docx - HLTH 503 – Quiz 6 1 Specificity refers to...

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HLTH 503 – Quiz 6 1. Specificity refers to the ability of a screening test to identify only nondiseased individuals who actually do not have the disease. TRUE (pg 478) 2. A test that determines whether disease is actually present is a – DIAGNOSTIC TEST (pg. 465) 3. Which set of symbols in Figure 11-3 represents high validity? C (pg. 475) 4. Validity is the ability of a measuring instrument to give a true measure TRUE (pg. 473) 5. A new screening test for Lyme disease is developed for use in the general population. The sensitivity and specificity of the new test are 60% and 70% respectively. Three hundred people are screened at a clinic during the first year the new test is implemented. Assume the prevalence of Lyme disease among clinic attendees is 10%, calculate: a) False Positives (81) ----- pg 477 Prevalence = 10%; a+c = 300*10% = 30 Sensitivity = 60% A = 30*sensitivity = 30*0.60=18 true positive A+C = 30 C=30-18 = 12 false negative Specificity = 70% 300-30 = 270  b+d D = 270*70% = 189 true negative B= 270-189 = 81  false positive 6. A screening examination was performed on 250 persons for Factor X, which is found in disease Y. A definitive diagnosis for disease Y among the 250 persons had been obtained previously. The results are charted below:

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HLTH 503 – Quiz 6 A=40; B=60; C=10; D=140 The specificity of this test is expressed as: 70% (pg 477) Specificity = d/(b+d) x 100 = 140/(60+140) = 140/200 = 0.7 x 100 = 70% 7. The sensitivity of this test is expressed as: 80% (pg 477) Sensitivity = a/(a+c) x 100 = 40/(40+10) = 40/50 = 0.8 x 100 = 80% 8. Choose the best answer. A test developed to assess age-related
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• Fall '12
• ProfessorLane
• Type I and type II errors, salmonellosis, HLTH 503 - Quiz 6 Answers

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