12) Construct a 99% confidence interval for the population mean, μ. Assume the population has a normal distribution. A group of 19 randomly selected students has a mean age of 22.4 years with a standard deviation of 3.8 years. a) Identify the best point estimate for the population mean µ. b) Find the critical values. Sketch the distribution curve and identify the critical values and confidence level on the graph. c) Find the margin of error. Round your answer to two decimal places. d) Construct the confidence interval.

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The text is an instructional exercise on constructing a 99% confidence interval for a population mean. Below is the transcription formatted for an educational website:

---

**Exercise: Confidence Interval for Population Mean**

Consider the following scenario to deepen your understanding of confidence intervals:

A group of 19 randomly selected students has a mean age of 22.4 years with a standard deviation of 3.8 years. 

**Tasks:**

a) **Identify the Best Point Estimate for the Population Mean (μ).**  
   Using the sample data, determine the most accurate point estimate for the population mean.

b) **Find the Critical Values:**  
   Sketch the distribution curve. Use the curve to identify the critical values and the confidence level on the graph.

c) **Calculate the Margin of Error:**  
   Compute the margin of error based on the given data. Ensure to round your answer to two decimal places.

d) **Construct the Confidence Interval:**  
   With the calculated margin of error and critical values, construct the confidence interval for the population mean.

Note: This exercise assumes the population follows a normal distribution.

--- 

Graphs or diagrams are not included in the text, but the instructional prompt suggests sketching a distribution curve as part of the exercise.
Transcribed Image Text:The text is an instructional exercise on constructing a 99% confidence interval for a population mean. Below is the transcription formatted for an educational website: --- **Exercise: Confidence Interval for Population Mean** Consider the following scenario to deepen your understanding of confidence intervals: A group of 19 randomly selected students has a mean age of 22.4 years with a standard deviation of 3.8 years. **Tasks:** a) **Identify the Best Point Estimate for the Population Mean (μ).** Using the sample data, determine the most accurate point estimate for the population mean. b) **Find the Critical Values:** Sketch the distribution curve. Use the curve to identify the critical values and the confidence level on the graph. c) **Calculate the Margin of Error:** Compute the margin of error based on the given data. Ensure to round your answer to two decimal places. d) **Construct the Confidence Interval:** With the calculated margin of error and critical values, construct the confidence interval for the population mean. Note: This exercise assumes the population follows a normal distribution. --- Graphs or diagrams are not included in the text, but the instructional prompt suggests sketching a distribution curve as part of the exercise.
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