The nutrition and food science division of Farnsworth Pharmaceuticals is alpha testing an OTC diagnostic kit so that adults who self-report a certain food allergy can affirm their insensitivity to that food allergen.  Preliminary clinical trials yielded that 25% of the volunteers who suspected they had food allergies were

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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The nutrition and food science division of Farnsworth Pharmaceuticals is alpha testing an OTC diagnostic kit so that adults who self-report a certain food allergy can affirm their insensitivity to that food allergen.  Preliminary clinical trials yielded that 25% of the volunteers who suspected they had food allergies were clinically identified as sensitive or intolerant to the food allergen; unfortunately and disappointingly, only 10% of those who tested positive in the clinic also tested positive with the kit.  Furthermore, of those self-reporting adult volunteers who had a negative clinic outcome, 5% tested positive anyway with the kit.  [COMMENTS & HINTS: Consider clinical sensitivity to the food allergen a positive result for testing purposes.  If necessary, round off percentages to the nearest hundredth, expressing as #.##% or ##.##%.]

 

Question: What is, therefore, the chance of a true positive outcome of this compound event: BOTH a positive result on the clinical diagnosis AND a positive result on the OTC kit diagnosis, given that the clinical diagnosis was positive?  HINT: What is the appropriate arithmetic operation to compute the probability of a compound event that utilizes the both ... and ... conjunction?  Express the answer as a percentage without insignificant digits, with percent symbol.

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