Suppose Apple Would Like to Test the Hypothesis That the Standard

Multiple Choice

Suppose Apple would like to test the hypothesis that the standard deviation for the web-browsing battery life of the iPad is different from 3.0 hours. The following data represents the battery life, in hours, experienced by a random sample of six users: 10 14 12 16 10 6.
Which of the following would be the correct hypothesis test?

A) H₀: σ² ≤ 3.0, H_A: σ² > 3.0
B) H₀: σ = 3.0, H_A: σ ≠ 3.0
C) H₀: σ² ≥ 9.0, H_A: σ² < 9.0
D) H₀: σ² = 9.0, H_A: σ² ≠ 9.0