which of the following python methods in scipy. stats submodule returns the p-value for performing a hypothesis test for the significance of the correlation coefficient? select one.

Not the answer but here is the graph. 

The answer is a or b

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.