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 how to fill the 2x2 sample table  

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An imaginary study is conducted to assess the performance of the anti-endomysial antibody test in diagnosing celiac disease. There were 800 people involved in the study and the prevalence of disease was 20%. The study found that the sensitivity and specificity of the test were 75% and 87.5%, respectively. Which of the follow statements is correct?

A) The positive predictive value is 80%.
B) The positive likelihood ratio is 6.0.
C) The false negative rate 12.5%.
D) The negative predictive value is 12.5%.

Answer and youtube lecture here...

i posted the youtube lecture after being alerted to the fact that one obstacle for solving biostats questions is figuring out what the values are for A, B, C, D, etc,. so its not just an explanation to the question (which is not the purpose of the lecture), but a step-by-step guide to filling in the sample table and making various calculations of statistical measures. i hope that this lecture will make that process a little easier for anyone who needs clarity on the topic.

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