6) When 415 college students were surveyed, 175 said they own their car. Construct a 95% confidence interval for the proportion of college students who say they own their cars.
6) When 415 college students were surveyed, 175 said they own their car. Construct a 95% confidence interval for the proportion of college students who say they own their cars.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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![**Problem Statement:**
When 415 college students were surveyed, 175 said they own their car. Construct a 95% confidence interval for the proportion of college students who say they own their cars.
**Solution:**
To solve this problem, follow these steps:
1. **Identify the Sample Proportion (p̂):**
\[
p̂ = \frac{x}{n} = \frac{175}{415}
\]
2. **Calculate the Standard Error (SE):**
\[
SE = \sqrt{\frac{p̂(1 - p̂)}{n}}
\]
3. **Determine the Z-score for 95% Confidence Interval:**
- For a 95% confidence level, the Z-score is approximately 1.96.
4. **Construct the Confidence Interval:**
\[
\text{Confidence Interval} = p̂ \pm Z \times SE
\]
This will give you the range within which the true proportion of college students who own their cars is likely to fall with 95% confidence.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F727e4093-8ead-4bf8-b086-0722c8766cbb%2Fdad5d90e-e791-4938-a4ed-a0ffb881cd74%2Fneaog59_processed.png&w=3840&q=75)
Transcribed Image Text:**Problem Statement:**
When 415 college students were surveyed, 175 said they own their car. Construct a 95% confidence interval for the proportion of college students who say they own their cars.
**Solution:**
To solve this problem, follow these steps:
1. **Identify the Sample Proportion (p̂):**
\[
p̂ = \frac{x}{n} = \frac{175}{415}
\]
2. **Calculate the Standard Error (SE):**
\[
SE = \sqrt{\frac{p̂(1 - p̂)}{n}}
\]
3. **Determine the Z-score for 95% Confidence Interval:**
- For a 95% confidence level, the Z-score is approximately 1.96.
4. **Construct the Confidence Interval:**
\[
\text{Confidence Interval} = p̂ \pm Z \times SE
\]
This will give you the range within which the true proportion of college students who own their cars is likely to fall with 95% confidence.
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