The average manufacturing work week in metropolitan Chattanooga was 40.2 hours last year. It is believed that the recession has led to a reduction in the average work week. To test the validity of this belief, the hypotheses are A) H₀: μ

Question

The average manufacturing work week in metropolitan Chattanooga was 40.2 hours last year. It is believed that the recession has led to a reduction in the average work week. To test the validity of this belief, the hypotheses are A) H₀: μ < 40.2 H_a: μ ≥ 40.2. B) H₀: μ ≥ 40.2 H_a: μ < 40.2. C) H₀: μ > 40.2 H_a: μ ≤ 40.2. D) H₀: μ = 40.2 H_a: μ ≠ 40.2.

Quizplus · Accepted Answer

The null hypothesis (HS) should always contain an equal sign. Hence, options A, C, and D can be ruled out.
The belief is that the average work week has reduced. Hence, the alternative hypothesis (Ha) should have a less than sign (<). Thus, option B is the correct choice.

The Average Manufacturing Work Week in Metropolitan Chattanooga Was 40