A correlation is a description of a relationship between two
variables (Aron, Aron, & Coupe, 2009). The relationship between two
equal-interval numeric variables is described by a normal measure of a
correlation (Aron, Aron, & Coupe, 2009). If indeed the correlation between
age and physical flexibility is -.68, then this means that the older individual
is he or she has less physical flexibility. This is considered a negative
correlation. A negative correlation is a relation between two variables in
which high scores on one go with low scores on the other (Aron, Aron, &
Coupe, 2009). On a scatter diagram as for the horizontal axis and vertical
axis, the horizontal axis represents age and the vertical axis represents
physical flexibility. Therefore, with a correlation between age and physical
flexibility of -.68 (negative correlation) the scatter diagram the dots would
go downward starting from the left toward the right basically in a straight
line. When a correlation is negative it slopes downward from left to the right
basically in a straight line (Aron, Aron, & Coups, 2009). If this was a
positive correlation then as for a scatter diagram the dots basically follow a
straight line sloping up and from the left to the right (Aron, Aron, &
Coups, 2009).

Reference

Aron, A., Aron, E. N., & Coups, E. (2009).
Statistics for psychology (5th ed.). Upper Saddle River, NJ: Pearson Prentice
Hall.

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