Wednesday HW!

I will be after school tomorrow (Thursday) until 3:15/3:30 to answer questions and prepare for our upcoming test.  You are invited to come by to...

1.) Complete your Thursday hw and ask any questions that come up!
2.) Work through a unit review to prepare for our upcoming test.
3.) Ask/discuss any questions you have about hypothesis tests/confidence intervals to prepare for our test!
4.) Use a Barron's review guide to continue practicing with confidence intervals and hypothesis tests!

Tonight (Wednesday) please complete the following for homework (based on today's notes on types of error):

Page 492-493: 11a-d, 13, 19a-d

• For 11d, 13cd, and 19, when considering "possible consequences," or who would be harmed, use the information given in the context (only)--don't go off on a tangent and make up your own stuff...
• For example, in #11, we are told, "Since this plan costs the city tax revenues, they will continue to use it only if there is strong evidence that the rate of home ownership is increasing." 
• Use this information to determine "who would be harmed" for each type of error
• Help with hypotheses and consequences:
• Consider #11...
• Ho: p = 0.683 
• What does this mean in words? This means: 68.3% of American families own a home--this is the wording we'll use when we say "the Ho is true"
• Ha: p > 0.683
• What does this mean in words? More than 68.3% of American families own a home
• For "who is harmed, consider this info: "They (the town) decide to adopt the plan (offering tax breaks to first time homeowners) on a 2 year trial basis...Since this plan costs the city tax revenues, they will continue to use it only if there is strong evidence that the rate of home ownership is increasing."
• Now, consider a Type I error--"In reality, 68.3% of Americans own a home, but our test suggests more than 68.3% of Americans own a home." As a result, the town things the tax breaks are working, but they are not. As a result, the town is harmed because the town loses money.
• Hypotheses for #13:
• No numbers here....
• For #13 we are trying to "find significant evidence that the shop is certifying vehicles that do not meet standards"--this is our Ha
• Ho: the show is NOT certifying vehicles that do not meet standards
• Ha: the shop is certifying vehicles that do not meet standards

Our test will have to be moved so we can fully cover chapter 21. Please vote on the poll (top right of blog) to determine the date of our test.

Wednesday (3/14): Chapter 21 (Types of Error)
Thursday (3/15): Chapter 21 (Types of Error, alpha, beta, and power)
Friday (3/16): Chapter 21 (Types of Error and Power)

Monday (3/19)/Tuesday (3/20): Unit Exam Inferences for Proportions (chapters 19-21), start chapter 22 (2 proportion Z Tests/Intervals--order determine by poll on blog)

Wednesday (3/21): SAT Day!
Thursday (3/22): Chapter 22 (2 Proportion Z Tests and Intervals) 
Friday (3/23): Chapter 22 (2 Proportion Z Tests and Intervals; chapter 22 take home quiz or test)

*Notice: we must cover all of chapter 22 in just 3 days! Come ready to learn and be super focused in class!*


Here are the answers to the "AP MC: Ch. 19 and 20," our classwork from Friday so you can use these to study for our upcoming test:

1. E
2. E
3. C
4. E
5. E
6. E
7. E
8. B
9. A
10. D
11. D
12. A
13. D
14. B
15. C

And here is the answer key to last night's homework in case you were out: