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 equals 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