If a scatter plot of variablesXandYshows a trend that can be summarized to a large degree by a straight line with slope 0.8 and y-intercept 0.2 (i.e.,Y= 0.2 + 0.8X), then the correlation coefficient betweenXandYis ______.

0.8, and there is a causal relation betweenXandY(eitherXcausesYorYcausesX)

0.8, but there is no causal relation betweenXandY

0.2, and there is a causal relation betweenXandY(eitherXcausesYorYcausesX)

0.2, but there is no causal relation betweenXandY

0.8, and there may be a causal relation betweenXandY, but not necessarily