pIC50 per experiment (-log10 IC50 in mol/L):
  experiment 1: A 7.13, B 6.56, A - B 0.57
  experiment 2: A 6.79, B 6.52, A - B 0.26
  experiment 3: A 6.94, B 6.51, A - B 0.43
  experiment 4: A 6.96, B 6.59, A - B 0.37
Geometric mean IC50: A 112 nM, B 285 nM
Paired (same plates): IC50 ratio B/A = 2.55 (95% CI 1.6 to 4.1), t = 6.41, df = 3, p = 0.008
Welch, pairing ignored: IC50 ratio B/A = 2.55 (95% CI 1.6 to 4.2), t = 5.69, df = 3.4, p = 0.008
Shortcut, all 216 wells pooled, F test of one shared IC50: F(1, 208) = 82.3, p < 1e-15