Kindly, indeed.
Thank you. I believe I’ve got it down now.
Prior:1/101
Test: Correct positive 95%
False positive 20%
1 of the 101 has the disease, with 95% probability of receiving a positive reading, denoting 1 x .95 = .95
And 100 don’t have the disease, each with a 20% probability of a positive reading, denoting 100 x .2=20
.95 + 20 = 20.95
.95 / 20.95 = .045, denoting a 4.5% chance that someone receiving a positive reading has the disease.
Thank you again :)
Kindly, indeed.
Thank you. I believe I’ve got it down now.
Prior:1/101
Test: Correct positive 95%
False positive 20%
1 of the 101 has the disease, with 95% probability of receiving a positive reading, denoting 1 x .95 = .95
And 100 don’t have the disease, each with a 20% probability of a positive reading, denoting 100 x .2=20
.95 + 20 = 20.95
.95 / 20.95 = .045, denoting a 4.5% chance that someone receiving a positive reading has the disease.
Thank you again :)