Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t,12, (b) find the critical value z,12, or (c state that neither the normal distribution nor the t distribution applies. Here are summary statistics for randomly selected weights of newborn girls: n = 188, x 32.2 hg, s = 6.1 hg. The confidence level is 95%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. ta/2 = (Round to two decimal places as needed.) Ов. Za/2= (Round to two decimal places as needed.) O C. Neither the normal distribution nor the t distribution applies.

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**Constructing a Confidence Interval**

When constructing a confidence interval, determine the appropriate critical value needed. Follow these steps based on the given data.

### Summary Statistics:
- **Sample size (n):** 188
- **Sample mean (x̄):** 32.2 hg
- **Sample standard deviation (s):** 6.1 hg
- **Confidence level:** 95%

### Instructions:
Select the appropriate option and, if necessary, fill in the answer box with your calculated value.

**Options:**

A. Calculate the critical value \( t_{\alpha/2} \).  
   - (Round to two decimal places as needed.)

B. Calculate the critical value \( z_{\alpha/2} \).  
   - (Round to two decimal places as needed.)

C. State that neither the normal distribution nor the t distribution applies.  

**Choose the correct statistical method based on the information provided.**

**Note:**
- Use a \( t \)-distribution if the sample size is small or the population standard deviation is unknown.
- Use a \( z \)-distribution when the sample size is large and the population standard deviation is known or approximated well by the sample standard deviation.

**Graph or Diagram Explanation:**
There were no graphs or diagrams in the image; focus on calculating and interpreting the critical values for constructing confidence intervals.
Transcribed Image Text:**Constructing a Confidence Interval** When constructing a confidence interval, determine the appropriate critical value needed. Follow these steps based on the given data. ### Summary Statistics: - **Sample size (n):** 188 - **Sample mean (x̄):** 32.2 hg - **Sample standard deviation (s):** 6.1 hg - **Confidence level:** 95% ### Instructions: Select the appropriate option and, if necessary, fill in the answer box with your calculated value. **Options:** A. Calculate the critical value \( t_{\alpha/2} \). - (Round to two decimal places as needed.) B. Calculate the critical value \( z_{\alpha/2} \). - (Round to two decimal places as needed.) C. State that neither the normal distribution nor the t distribution applies. **Choose the correct statistical method based on the information provided.** **Note:** - Use a \( t \)-distribution if the sample size is small or the population standard deviation is unknown. - Use a \( z \)-distribution when the sample size is large and the population standard deviation is known or approximated well by the sample standard deviation. **Graph or Diagram Explanation:** There were no graphs or diagrams in the image; focus on calculating and interpreting the critical values for constructing confidence intervals.
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