one‑tail p 0.001 0.0025 0.005 0.01 0.025 0.05 0.1 0.25 two‑tail p 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 df = 1 318.3 127.3 63.66 31.82 12.71 6.314 3.078 1.000 2 22.33 14.09 9.925 6.965 4.303 2.920 1.886 0.816
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