If the $r$-value is close to $\pm 1$, then the trendline and data mesh well. If it's close to $0$, then the points do not mesh with the line very well. Here the sums all run from $1$ to $N$, where $N$ is the number of data points.
Now you try. Fill in the r= line to compute the $r$-value.
Type your code here:
See your results here:
We got r=0.98.
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