In reference to Inferential Statistics, for 20 degrees of freedom, the least statistical t-value among the given below is:

t (0.05)

The correct answer is Option (4) → t (0.05)

Given: Degrees of freedom (df) = 20

The least statistical t-value corresponds to the largest cumulative probability (smallest tail probability).

From t-distribution table for df = 20:

t(0.05) ≈ 1.725

t(0.025) ≈ 2.086

t(0.01) ≈ 2.528

t(0.005) ≈ 2.845

The least t-value is t(0.05) = 1.725