Find the angle between each of the pairs of vectors and in exercises 4 through 6.
The angle between and is about 0.1 2 1 9 radians.
The correlation coefficient r between two characteristics of a population is the
Cosine of the angle between the deviation vectors and for the two characteristics:
The given vectors are and .
The angle formula role="math" localid="1659426804326" .
Now, calculate the angle by substituting the required values into the angle formula.
Hence, the value of is about radians.
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