Compute the r

Five paired observations:

$x$	1	2	3	4	5
$y$	10	9	7	6	3

With $\bar x = 3$ and $\bar y = 7$ : $\sum (x - \bar x)(y - \bar y) = -17$ , $\sum (x - \bar x)^2 = 10$ , $\sum (y - \bar y)^2 = 30$ .

Using $r = \dfrac{\sum (x - \bar x)(y - \bar y)}{\sqrt{\sum (x - \bar x)^2 ; \sum (y - \bar y)^2}}$ , what is $r$ ?

About $+0.98$ : correlation is reported as a strength, and the sign is carried separately by the slope.

About $-0.98$ : the points sit very close to a falling straight line.

$-4.25$ , the sample covariance $-17/4$ , which is what the correlation coefficient reports.

About $-0.57$ , from $-17/30$ , dividing by the spread of $y$ .