To determine the most moderate correlation, we calculate the absolute values of the r-values:
\[
|r_1| = 0.92, \quad |r_2| = 0.18, \quad |r_3| = 0.56, \quad |r_4| = 0.83
\]
Step 3: Find the Most Moderate Correlation
The most moderate correlation corresponds to the r-value with the smallest absolute value. Among the calculated absolute values, we find:
\[
\min(0.92, 0.18, 0.56, 0.83) = 0.18
\]
Thus, the r-value that represents the most moderate correlation is:
\[
r = -0.18
\]