Drag the black points to alter the proportion of blue and green cabs and the probability that the witness identifies a cab correctly.

The Blue areas represent the theoretical proportion of cabs that the witness would identify as blue.

Can you find some situations in which the probability that the can is blue given that the witness identified the cab as blue is 0.5?

Doubleclick on the applet to open the cabirjava toolbox. You can use the rightmost button to download the figure this applet was generated from.

© David Kay Harris 1999-2002