Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t/2, (b) find the critical value za/2, or (c) state that neither the normal distribution nor the t distribution applies.

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**Constructing Confidence Intervals**

Assume that we want to construct a confidence interval. You need to do one of the following, as appropriate:
- (a) Find the critical value \( t_{\alpha/2} \).
- (b) Find the critical value \( z_{\alpha/2} \).
- (c) State that neither the normal distribution nor the t distribution applies.

The confidence level is 99%, \( \sigma \) (standard deviation) is not known, and a histogram of 57 player salaries (in thousands of dollars) for football players on a team is shown below.

**Histogram Explanation:**
- The horizontal axis represents the salary (in thousands of dollars).
- The vertical axis represents the frequency (number of players).
- Most players have salaries clustered at the lower end of the scale, with a sharp decrease in the number of players as the salary increases.

**Choices:**
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

- **A.** \( t_{\alpha/2} = \) ______ (Round to two decimal places as needed.)
- **B.** \( z_{\alpha/2} = \) ______ (Round to two decimal places as needed.)
- **C.** Neither the normal distribution nor the t distribution applies.
Transcribed Image Text:**Constructing Confidence Intervals** Assume that we want to construct a confidence interval. You need to do one of the following, as appropriate: - (a) Find the critical value \( t_{\alpha/2} \). - (b) Find the critical value \( z_{\alpha/2} \). - (c) State that neither the normal distribution nor the t distribution applies. The confidence level is 99%, \( \sigma \) (standard deviation) is not known, and a histogram of 57 player salaries (in thousands of dollars) for football players on a team is shown below. **Histogram Explanation:** - The horizontal axis represents the salary (in thousands of dollars). - The vertical axis represents the frequency (number of players). - Most players have salaries clustered at the lower end of the scale, with a sharp decrease in the number of players as the salary increases. **Choices:** Select the correct choice below and, if necessary, fill in the answer box to complete your choice. - **A.** \( t_{\alpha/2} = \) ______ (Round to two decimal places as needed.) - **B.** \( z_{\alpha/2} = \) ______ (Round to two decimal places as needed.) - **C.** Neither the normal distribution nor the t distribution applies.
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