Stats

Question 1

Stats

Sensitivity

Answer 1

If someone is very sensitive they cry (OUT disease) every time they are hit. They also cry (OUT disease) every time they think they are going to be hit. They are always crying (OUT) so if you dont hear anything from a sensitive test, theres nothing there

Sen test will go crazy in a room full of disease

Probability the test is + given the person actually has the disease

P (T+ l D+)

Question 2

Stats

Specificity

Answer 2

If someone is very specific picky eater they only call things food (disease) if its a chicken nugget. Sometimes things are food (disease) but they wont recognize it as food (and keep you INside the house to cook nuggets). They are very specific so if you hear something from a specific test (+) you KNOW its food (disease)

Spec test will be silent in a room full of healthy people

Probability the test is - given the person does not have the disease

P ( T- l D-)

Question 3

Stats

PPV

Answer 3

How well does this positive test predict the disease, that would be valuable

Probability of actually having a disease given the test is +

P ( D+ l T+)

Question 4

Stats

NPV

Answer 4

how well does this negative test predict health, that would be valuable

Probability of not having the disease given the test is -

P ( D- l T-)