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