YouTube Would Like to Test the Hypothesis That the Standard

YouTube would like to test the hypothesis that the standard deviation for the length of an online video watched by a user is more than 2 minutes. The correct hypothesis statement would be .

A) H₀: a² c 4.0; H₁: a² > 4.0
B) H₀: µ c 4.0; H₁: µ < 4.0
C) H₀: a² = 2.0; H₁: a² × 2.0
D) H₀: a²= 4.0; H₁: a² × 4.0