1. Part IV of AP Statistics
Inference
Part IV of AP Statistics

2. Inference
Draw conclusions about a population from sample data

3. The Basics of Confidence Intervals
Section 10.1

4. Readability Test
What makes a book easier or more difficult to read? An interesting story line, intriguing characters, and an appealing writing style certainly help. But from an educator’s standpoint, the readability of a book or article depends mainly on word and sentence length. In this Activity, you will learn some methods for evaluating readability.

5. Readability Test Work with a partner.
Use your calculator to randomly choose a page from our book, pg
Count the length of the first 100 words on that page. If it doesn’t have 100 words, go to the next page.

6. Readability Test
Calculate the mean and standard deviation of the numbers of letters per word.
Now construct an interval using the formula,

7. Section 10.1: The Basics of Confidence Intervals
Confidence Interval=estimate margin of error
Confidence Level (C)= probability that the interval will capture the true parameter value in repeated samples
Which interval will be wider, confidence level of 90% or 99%?

9. In class: pg. 625 #1

10. Homework
Pg. 625 #2-5