**Answer:**

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**Answer:**

d) one direction

**Explanation:**

The purpose of the various valves in the circulatory system is to keep blood flowing in **one direction**. The valve opens to allow blood flow one way, and closes to prevent blood flow the other way.

Based on the information given, the interpretation of the **confidence level** will be that **ninety percent** of the time, the procedure used to generate this **interval** will capture the true **proportion** of teenagers who drive their own car to school.

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**What is confidence level?**</h3>

A **confidence level** simply means the percentage of **probability** that then m confidence interval will contain the true **population parameter** when the person draws a **random sample.**

It should be noted that a 90% **confidence** **interval** means a range of values that the person is 90% sure contains the true **mean** of the **population**.

Learn more about **confidence level** on:

brainly.com/question/15712887