YouTube Would Like to Test the Hypothesis That the Standard

Multiple Choice

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