A researcher calculates correlations: (1) Hours studied vs. exam score: $r = 0.82$; (2) Shoe size vs. IQ: $r = 0.08$; (3) Daily screen time vs. sleep quality: $r = -0.76$. Using the categories weak ($|r| < 0.3$), moderate ($0.3 \le |r| \le 0.7$), strong ($|r| > 0.7$), which categorization is correct?