Lesson 20: Estimating Population Means

Watch the video Confidence Intervals.

1. Why is a single blood pressure reading not sufficient if we want to estimate a person’s average blood pressure?
2. What are the two parts of any confidence interval?
3. What assumptions need to be checked before computing a confidence interval?
4. In plain language, what does “95% confidence” mean?

Suppose that a hospital administrator states that a statistical experiment has indicated that “With 90 percent certainty, the average weight at birth of all boys born at the certain hospital is between 6.6 and 7.2 pounds.” How would you interpret this statement?