1. What is the difference between parameters and statistics?

2. In general, is the mean of several observations more or less variable than single observations from a population? Explain.

3. Why is a single blood pressure reading not sufficient if we want to estimate a person's average blood pressure?

4. What are the two parts of any confidence interval?

5. What assumptions need to be checked before computing a confidence interval?

6. In plain language, what does "95% confidence" mean?