# Statistics Chapter 11 Homework Answers

AP Stats Chapter 11 Practice Test –Multiple Choice1. DDT is an insecticide that accumulates up the food chain. Predator birds can be contaminated with quite high levels of the chemical by eating many lightly contaminated prey. One effect of DDT upon birds is to inhibit the production of the enzyme carbonic anhydrase, which controls calcium metabolism. It is believed that this causes eggshells to be thinner and weaker than normal and makes the eggs more prone to breakage. (This is one of the reasons why the condor in California is near extinction.) An experiment was conducted where 16 sparrow hawks were fed a mixture of 3 ppm dieldrin and 15 ppm DDT (a combination often found in contaminated prey). The first egg laid by each bird was measured, and the mean shell thickness was found to be 0.19 mm. A “normal” eggshell has a mean thickness of 0.2 mm. The null and alternative hypotheses areA)B)C)D)E)ANSWER: AThe null hypothesis (H0) always refers to the population value for the mean (0.2).The alternate hypothesis (Ha) always refers to the belief or theory of the researchers in relation to the supposed mean of the population. Here it is stated “It is believed that this causes eggshells to be thinner and weaker than normal and makes the eggs more prone to breakage.” Thinner eggshell means the thickness will be less thanthe normal mean.2. A significance test allows you to reject a hypothesis in favor of an alternative Haat the 5% level of significance. What can you say about significance at the 1% level?A)can be rejected at the 1% level of significance.B)There is insufficient evidence to reject at the 1% level of significance.C)There is sufficient evidence to accept at the 1% level of significance.D)Hacan be rejected at the 1% level of significance.E)The answer can’t be determined from the information given.ANSWER: EUnless we actually know the p-value, we cannot reach any of the conclusions made in a-d. For example, if the p-value was 0.0321, it would NOT be significant at the 1% level. But if the p-value was .0031, it WOULD be siginificant at the 1% level. Both of those values are significant at the 5% level, but only one of them is at the 1% level.3. In a test of H0: µ= 100 against Ha: µ100, a sample of size 80 produces z= 0.8 for the value of the test statistic. The P-value of the test is thus equal toA) 0.20 C) 0.29B)0.40 D) 0.42 E) 0.21ANSWER: DThe p-value is dependent on the z-score and the alternate hypothesis (Ha).Here, z = 0.8. Using Table A, we see that the probability of such a result or greater is .2119. Since we have a “not equal to” alternate hypothesis, we must double the p-value. So the final

Chapter 11 Warmup

Chapter 11 Classwork

*Homework:*

page 288: #8, 10, 12, 14, 18, 19, 21 *HW answers: *page 288

Read Chapter 12

Print Chapter 12 Notes if you want them Chapter 12 Notes

**10/16/17 & 10/17/17**

**10/14/13**Grade AP Problem

Ch. 11- notes and examples: Ch. 11 notes.doc

answers to today: Ch. 11 notes.pdf

simulations worksheet: Ch. 11- Simulations worksheet.doc (don't print)

HW: Complete #1 & 2 on Ch. 11 simulations worksheet

p. 265 #5, 6, 7, 12, 13, 14

answers: HW p. 265.doc

Read Ch. 11

Test on Unit 3 on 10/24 - See more at: https://www.cbsd.org/Page/13283#sthash.G0jb9cZm.dpuf

*Classwork:*

Notes on Chapter 12 Chapter 12 Notes filled in

Random Rectangles Activity Random Rectangles Activity Sheet of Random Rectangles

Book Problems: page 289 #15, 16, 17, 22, 23, 25 page 289 book problems answers

Chapter 12 Classwork

*Homework: *

Finish Classwork if necessary

page 289: #18, 19, & 21

Read Chapter 13

Print Chapter 13 Notes if you want them Chapter 13 Notes

**10/18/17**

Homework Quiz 9

*Classwork: *

Notes on Chapter 13 Chapter 13 Notes Filled In

Designing Experiments Practice Designing Experiments Practice

*Homework:*

page 312: 7, 8, 10, 11, 12, 16, 17, 40 *HW answers:*page 312

Read Chapter 13

**10/19/17**

**10/14/13**Grade AP Problem

Ch. 11- notes and examples: Ch. 11 notes.doc

answers to today: Ch. 11 notes.pdf

simulations worksheet: Ch. 11- Simulations worksheet.doc (don't print)

HW: Complete #1 & 2 on Ch. 11 simulations worksheet

p. 265 #5, 6, 7, 12, 13, 14

answers: HW p. 265.doc

Read Ch. 11

Test on Unit 3 on 10/24 - See more at: https://www.cbsd.org/Page/13283#sthash.G0jb9cZm.dpuf

*Classwork:*

Finish Chapter 13 Notes

Experimental Design Review Worksheet Review of Experimental Design

*Homework:*

Videos:

Video #1: http://www.youtube.com/watch?v=yfRVCaA5o18

Video #2 (part 1 about sham surgeries): http://www.youtube.com/watch?v=QvbQnMvhQFw

Video #3: http://www.youtube.com/watch?v=wsFTgirKXHk

Video #4 (optional): http://www.youtube.com/watch?v=v_feOG94IAs

Finish Review Questions*HW answers:*See answers above

**10/20/17**

**10/14/13**Grade AP Problem

Ch. 11- notes and examples: Ch. 11 notes.doc

answers to today: Ch. 11 notes.pdf

simulations worksheet: Ch. 11- Simulations worksheet.doc (don't print)

HW: Complete #1 & 2 on Ch. 11 simulations worksheet

p. 265 #5, 6, 7, 12, 13, 14

answers: HW p. 265.doc

Read Ch. 11

Test on Unit 3 on 10/24 - See more at: https://www.cbsd.org/Page/13283#sthash.G0jb9cZm.dpuf

*Classwork:*

Complete AP Problems Chapter 13 AP Problems Chapter 13 AP Problems answers

*Homework:*

**10/24/17**

Unit 3 Exam

*Homework:*

Post Unit 3 Quiz Quiz: http://www.quia.com/quiz/3894620.html (due Friday)

Print Chapters 14 & 15 Notes if you want them Chapters 14 & 15 Notes

**Unit 3 Review Materials**

Unit 3 Review: Unit 3 Review Packet

Unit 3 Review Answers: Unit 3 Review Answers

Unit 3 Multiple Choice: Unit 3 Multiple Choice Review

Unit 3 Multiple Choice Answers: Unit 3 Multiple Choice Review Answers