If n-27, (x-bar)=42, and s-4, construct a confidence interval at a 99% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place. <μ<

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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### Constructing a Confidence Interval

**Problem Statement:**
Given the following statistical data:
- Sample size (\(n\)) = 27
- Sample mean (\(\bar{x}\)) = 42
- Sample standard deviation (\(s\)) = 4

Construct a confidence interval at a 99% confidence level, assuming the data came from a normally distributed population.

**Instructions:**
Calculate the confidence interval for the population mean (\(\mu\)) and provide the answers rounded to one decimal place.

**Solution:**
To construct the confidence interval, follow these steps:

1. **Identify the sample statistics:**
    - Sample size (\(n\)) = 27
    - Sample mean (\(\bar{x}\)) = 42
    - Sample standard deviation (\(s\)) = 4

2. **Determine the critical value:**
    - For a 99% confidence level with 26 degrees of freedom (\(df\)), use the t-distribution to find the critical value (\(t^*\)).

3. **Calculate the margin of error (ME):**
    \[\text{ME} = t^* \times \left(\frac{s}{\sqrt{n}}\right)\]

4. **Construct the confidence interval:**
    \[
    \bar{x} - \text{ME} < \mu < \bar{x} + \text{ME}
    \]

Since this is an educational site, it is expected that the user will perform these calculations or the steps might be demonstrated in the subsequent steps of the lesson.

5. **Final Solution Box:**
    Users will input their computed confidence interval here:
    \[
    < \mu <
    \]
Transcribed Image Text:### Constructing a Confidence Interval **Problem Statement:** Given the following statistical data: - Sample size (\(n\)) = 27 - Sample mean (\(\bar{x}\)) = 42 - Sample standard deviation (\(s\)) = 4 Construct a confidence interval at a 99% confidence level, assuming the data came from a normally distributed population. **Instructions:** Calculate the confidence interval for the population mean (\(\mu\)) and provide the answers rounded to one decimal place. **Solution:** To construct the confidence interval, follow these steps: 1. **Identify the sample statistics:** - Sample size (\(n\)) = 27 - Sample mean (\(\bar{x}\)) = 42 - Sample standard deviation (\(s\)) = 4 2. **Determine the critical value:** - For a 99% confidence level with 26 degrees of freedom (\(df\)), use the t-distribution to find the critical value (\(t^*\)). 3. **Calculate the margin of error (ME):** \[\text{ME} = t^* \times \left(\frac{s}{\sqrt{n}}\right)\] 4. **Construct the confidence interval:** \[ \bar{x} - \text{ME} < \mu < \bar{x} + \text{ME} \] Since this is an educational site, it is expected that the user will perform these calculations or the steps might be demonstrated in the subsequent steps of the lesson. 5. **Final Solution Box:** Users will input their computed confidence interval here: \[ < \mu < \]
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