Exhibit 9-5 n = 16 HỌ: µ z 80 x = 75.607 Hạ: u < 80 o = 8.246 Assume the population is normally distributed. 3. Refer to Exhibit 9-5. The test statistic equals O.53 O-2.131 O-.53 2.131

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**Exhibit 9-5:**

- Sample size (\( n \)): 16
- Sample mean (\( \bar{x} \)): 75.607
- Population standard deviation (\( \sigma \)): 8.246

**Hypotheses:**

- Null hypothesis (\( H_0 \)): \( \mu \geq 80 \)
- Alternative hypothesis (\( H_a \)): \( \mu < 80 \)

Assume the population is normally distributed.

**Question 3:**

Refer to Exhibit 9-5. The test statistic equals ____.

- \( \circ \) .53
- \( \circ \) -2.131
- \( \circ \) -.53
- \( \circ \) 2.131

(Note: Calculating the correct test statistic involves using the formula for a z-test: \( z = \frac{\bar{x} - \mu}{\sigma/\sqrt{n}} \). Plug in the values to find the correct answer from the options.)
Transcribed Image Text:**Exhibit 9-5:** - Sample size (\( n \)): 16 - Sample mean (\( \bar{x} \)): 75.607 - Population standard deviation (\( \sigma \)): 8.246 **Hypotheses:** - Null hypothesis (\( H_0 \)): \( \mu \geq 80 \) - Alternative hypothesis (\( H_a \)): \( \mu < 80 \) Assume the population is normally distributed. **Question 3:** Refer to Exhibit 9-5. The test statistic equals ____. - \( \circ \) .53 - \( \circ \) -2.131 - \( \circ \) -.53 - \( \circ \) 2.131 (Note: Calculating the correct test statistic involves using the formula for a z-test: \( z = \frac{\bar{x} - \mu}{\sigma/\sqrt{n}} \). Plug in the values to find the correct answer from the options.)
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