conditional probabilities and bayes theorem

[raouf]

there is a sensor that senses the presence of cars in a parking spot, to determine the effectiveness of the sensor you run two tests.
Test 1 - Fire the sensor 1000 times while a car is present in its field of view
Test 2 - Fire the sensor 800 times while a car is NOT present in its field of view

Test	No of times the sensor output indicated “detected a car”	No of times the sensor output indicated “did NOT detect a car”
Test 1	600	400
Test 2	160	640

1.) p(Z=sense_ car_presense ┤|X=car_is_present)
2.) p(Z=sense_ car_absence ┤|X=car_is_NOT_present)

 

[Steven G]

Please read the posting guidelines and then submit an appropriate post. You seem to be confusing this forum with a math homework service. This is a math help forum.