# Ap Stats Ch 20 Homework Answers

** Monday, November 28** (Day 3)

CW: complete Ch.19 Quiz WS; review hwk; ch.20 notes... hypothesis/significance testing; null and alternative hypotheses; p-value; 5-steps; examples; Handout; Class Notes

HW: p.476: # 1-17 odd

__Tuesday, November 29 (Day 4)__CW: review hwk; warm-up MC; work on practice problems from book (and finish for HW)

HW: p.476: # 19-23 odd, 27-31 odd

__Wednesday, November 30 (Day 5)__CW: warm-up ch.20 Quiz WS; ch.21 notes... what does p-value mean?; alpha-level; statistically significant; type I and II errors; power; increasing the power; Class Notes; Handout

HW: p.499: # 1-7 odd, 11, 15, 19-25 odd

__Thursday, December 1 (Day 6)__CW: warm-up problems; review hwk; begin ch.22 notes... inference for 2-sample proportions; Class Notes

HW: finish last problem from class

__Friday, December 2 (Day 7)__CW: warm-up ch.21 Quiz WS; review hwk; 2 practice AP problems... 2002 and 1998; Class Notes; AP Problems WS

HW: (1) p.519: # 3, 9, 13, 17, 21; (2) Life After High School WS problems

__Monday, December 5 (Day 8)__CW: review hwk; complete last 2 AP problems; work on extra book (p.520: # 5, 11, 23, 25, 29, 31 and p.523: # 7, 15, 27, 29, 31, 37) and/or multiple choice problems; Solutions to AP Review Problems

**CW:**

__Tuesday, December 6 (Day 9)__

**Unit 6 TEST**

HW: study for test

**This weekend you should practice the hypotheses, conditions, and math steps for the 3 contexts provided in class (or below)!**

**For each context....****First, define your hypotheses**- Be sure to label the "Ho" and "Ha," and to use the correct parameter
**Next, check the conditions**- Random sample (or random assignment of treatments?)
- sample < 10% of population (in context)?
- np>10 and n(1-p)>10
- Remember to use the value of p from our null hypothesis because we always assume the null is true!
**Third, do the math!****Copy your calculator screen (one prop z test)**- This provides the name of the test, z score, pvalue, p-hat, and n
*Be sure to label p-value, not just p from the calc (we have a lot of p's to keep track of)***Show the z-score formula**- Be sure to label this as z!
- Just like we provided a formula to show
*how*our calculator found a confidence interval, we're providing a formula to show*how*our calculator got the z-score! **Sketch the Normal model**- Use the "draw" option under one-prop-z test to sketch the model!

- Here are the contexts in case you lost yours or were absent:

**Want to learn more about hypothesis testing or even to get ahead?**- Read chapter 20 of your textbook!
- Check out the "Step by Step" example on page 459
- Read about "one tailed tests" and "two tailed tests" under the "Alternative Alternatives" heading on page 458
- For calculator help look at the yellow box on page 461
- Read about p-values and what they mean on page 462
- Look at the "Step by Step" example using a hypothesis test AND a confidence interval on pages 463-466
- Watch the
**AP Stats Guy videos...** **Unit 5****Hypothesis Testing = videos 6, 10, 11, 12, 13****Confidence Intervals = videos 6, 7, 8, 9**

If you're feeling ambitious this weekend, here's Monday's homework--you don't know how to write the conclusion yet, but you can complete the hypotheses, conditions, and math if you like....

Page 470-471: 9, 17, 21, 23

- For #17 we cannot use a one prop z test--you job is to explain why (there is more than one reason)

On Monday (in class) we'll discuss what p-values mean, and then how we can use a p-value to write a conclusion. See you there!

Have a great weekend everyone!

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