If two variables x and y are perfectly positively correlated then in the scatter diagram every point (x, y) lies on ans. A straight line whose gradient is negative a parabola none A straight line whose gradient is positive

If two variables x and y are perfectly positively correlated then in the scatter diagram every point (x, y) lies on

If the plotted points in a scatter diagram lie from upper left to lower right, then the correlation is(a) Positive(b) Zero(c) Negative(d) none of these

How does a curvilinear relationship between two variables appear on a scatter plot?As a straight upward sloping line.As a straight downward sloping line.As a curve.As a cluster of points with no discernible pattern

What do all the least-squares fit lines have in common?A positive r indicates a positive correlation: as x increases, y also tends to increase.D. Set r to –0.90. Click Same r several times. What do the least-squares fit lines forthese scatter plots have in common?A negative r indicates a negative correlation: as x increases, y tends to decrease

16. Scatter diagrams are useful to learn … the X and Y variables have high or low correlations.1 poina. wetterb. wetherc. weatherd. whether