What is a null hypothesis for a one-tailed sign test? A)H₀: π = 0 B)H₀: π ≥ 1.00 C)H₀: π = 0.50 D)H₀: π ≤ 0.50

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In a one-tailed sign test, we are interested in whether the proportion of positive or negative differences is significantly different from a hypothesized value. Therefore, the null hypothesis should be that the proportion (π) of positive differences is less than or equal to a certain value (usually 0.5 for a one-tailed test). Hence, the correct null hypothesis is H₀: π ≤ 0.50, and the best answer choice is D.

What Is a Null Hypothesis for a One-Tailed Sign Test