In a poll of 1000 randomly selected voters in a local election, 388 voters were against school bond measures. What is the 99% confidence interval? [Ex: 0.123 Ex: 0.123 ] [smaller value, larger value]

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### Critical Values for Confidence Intervals - Educational Resource

#### Critical Values for Quick Reference During This Activity

A table of critical values for various confidence levels is provided below to assist you in determining confidence intervals:

| Confidence Level | Critical Value (z*) |
|------------------|---------------------|
| 0.90             | 1.645               |
| 0.95             | 1.960               |
| 0.99             | 2.576               |

#### Example Problem:

**Scenario:**
In a poll of 1,000 randomly selected voters in a local election, 388 voters were against school bond measures.

**Question:**
What is the 99% confidence interval?

**Instructions:**

To find the 99% confidence interval, you will need to:

1. Identify the critical value for the 99% confidence level from the provided table (z* = 2.576).
2. Apply the appropriate statistical formula to calculate the confidence interval.

**Interactive Element:**
You'll be asked to input the smaller and larger values of the confidence interval in the format:
\[ [\text{Ex: 0.123, Ex: 0.123}] \]

Use the provided tools to input your answer and check if you've calculated it correctly:

- **Check**: Verify your answer.
- **Next**: Proceed to the following question.

Remember to carefully apply the formulas and ensure calculations are correct to achieve an accurate interval estimate.
Transcribed Image Text:### Critical Values for Confidence Intervals - Educational Resource #### Critical Values for Quick Reference During This Activity A table of critical values for various confidence levels is provided below to assist you in determining confidence intervals: | Confidence Level | Critical Value (z*) | |------------------|---------------------| | 0.90 | 1.645 | | 0.95 | 1.960 | | 0.99 | 2.576 | #### Example Problem: **Scenario:** In a poll of 1,000 randomly selected voters in a local election, 388 voters were against school bond measures. **Question:** What is the 99% confidence interval? **Instructions:** To find the 99% confidence interval, you will need to: 1. Identify the critical value for the 99% confidence level from the provided table (z* = 2.576). 2. Apply the appropriate statistical formula to calculate the confidence interval. **Interactive Element:** You'll be asked to input the smaller and larger values of the confidence interval in the format: \[ [\text{Ex: 0.123, Ex: 0.123}] \] Use the provided tools to input your answer and check if you've calculated it correctly: - **Check**: Verify your answer. - **Next**: Proceed to the following question. Remember to carefully apply the formulas and ensure calculations are correct to achieve an accurate interval estimate.
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