BEYOND THE NUMBERS 3.2 LEARNING ouTcoMES 1 To 3 Dichotomous Decisions C Name Sec
ID: 3241417 • Letter: B
Question
BEYOND THE NUMBERS 3.2 LEARNING ouTcoMES 1 To 3 Dichotomous Decisions C Name Section Number: To be graded, all assignments must be completed and submitted on the original book page. Grading the FOB Test Patients with Bowel Cancer (as confirmed on endoscopy) of the FOB Negative Fos Positive Negative The Fecal occult Blood (FOB) test is used to screen people for bowel cancer. As expected, if it comes up positive, then you are told you likely have bowel cancer. If it comes up negative, you are told you are likely okay. So the outcome is dichotomous: either a "thumbs up" or a "thumbs down." A study involving 203 people was designed to assess how well the FOB works. Two things were recorded for each participant in the study: whether the FOB said they had bowel cancer and whether they really did (as determined by an endoscopy). The results are in the table above. Questions 1. How do you know from the table that there were 203 people in the study? 2 t 13 t I t 2. How many times did the FOB make the right decision? 24 203 3. What percentage of the time did the FoB make the right decision? 10.647 BEYOND THE NUMBERS 3.2 227Explanation / Answer
1).The total number of patients involved in the study are .
2+1+18+182= 203.
2.) 2/203 =0.009 , since the fob test gave the positive result when it was actually positive is 2 .
3.) Fob made the right decision only 1% of the time (approx).
4.) When the fob shows positive results to the patients when they actually dint have bowel cancer then they might end up getting treatments that is not needed al, and this could adversely affect their health.
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