Helping math teachers bring statistics to life
Learning Targets

Find and interpret conditional probabilities using twoway tables.

Use the conditional probability formula to calculate probabilities.

Determine whether two events are independent.
Chapter 8 Test
Chapter 8  Day 9
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Questions to be Sure to Include

A multiple choice question that gives four different ways to interpret the confidence level.

A multiple choice question where students have to find the sample size necessary for a particular margin of error (use a proportion rather than a mean!)

A multiple choice question which compares features of the Normal distribution to features of a tdistribution.

On the free response, you should have two questions. One question asking students to calculate and interpret a confidence interval for a proportion, and one for a mean. Use old AP questions if possible.

Consider having a follow up question part (b) for each confidence interval. Here are some options for your followup question:

Someone claims that the true parameter is ________. Does your confidence interval from part (a) provide convincing evidence against this claim? Explain.

Why do we check the (random, 10%, Large Counts) condition?

We would like to reduce the margin of error to ______. What sample size would be needed to accomplish this?

A follow up question that requires students to take the endpoints of their confidence interval and multiply or divide them both by a constant (for example 2017 #2).

Tips to Give Your Students

Close reading and careful writing are critical to your success this year.

Be sure to answer all parts of each question.

There are a lot of formulas in this Chapter. Don’t memorize them. Understand them. Use the (general formula, specific formula, plug numbers in, find answer) approach.

Study the Chapter 8 Formula Review and the Chapter 8 Big Ideas.

Know what needs to be included for a free response question asking for a confidence interval (4step process!) Need more 4step practice? Try these: Word  PDF  Answer Key