Monday HW

Back to normal...sorry I was out :(

A few things

I need your SSS permission slip by Wednesday.

AP registration paperwork is due Friday.

Homework: get your quiz done for Wednesday! (if you need the questions you can find them below).

Also, complete page 470: 13,15,25. Make sure you show work! I'm checking and there'll be no credit for copying answers!

Friday's Classwork:

Here's your quiz for today. Please write your answers on separate paper and hand this in before the end of class. If everyone finishes, you may work with a partner to finish up your multiple choice or work on your reading quiz. Both of these will be collected Monday.

Confidence Intervals Quiz (Due by the end of class; NO NOTES, NO PARTNERS) (28 points)

1.) A Rutgers University study released in 2002 found that many high-school students cheat on tests. The researchers surveyed a random sample of 4500 high school students nationwide; 74% of them said they had cheated at least once.

a.) Create a 90% confidence interval for the level of cheating among high-school students. (Don’t forget the conditions!) Show all of your work. (6 points)

b.) In a complete sentence, interpret your confidence interval from part a. (3 points)

c.) A teacher surveys his students and finds that 68% of students have cheated on a test. Does this value seem reasonable? Surprising? Explain your reasoning. (3 points)

d.) Suppose we sample 2,000 students and find that 67% have cheated. Calculate the margin of error. (3 points)

e.) It had been believed that 3 out of every 4 students had cheated on a test in 2000. Does the confidence interval above suggest that this percentage has fallen? Explain. (3 points)

f.) Explain what 90% confidence means IN THIS CONTEXT. (3 points)

g.) If we want to have a margin of error of only 3% and want 98% confidence, how large of a sample must be used? (5 points)

h.) What is the probability that our confidence interval contains the true proportion of students who have cheated? (2 points)

QUIZ WILL BE TOMORROW!

I apologize for being out today; I'm rocking a pretty ridiculous fever and the stomach isn't treating me so well.

You WILL have your quiz tomorrow. It'll only be questions like those found on your Quiz A/C worksheet. Study study study! I wouldn't give this to you if I didn't think you could handle it.

As for today, hopefully you got your MC done; if you're reading this, you can hand in the chapter 20 reading quiz on Monday, leaving only the rest of your MC for homework.

I hope to see you all tomorrow, enjoy your afternoon.

Wednesday 2/23 HW

Page 469: 1,2,3,5,7,9,10

Tuesday's HW

This will be our final homework from chapter 19; tomorrow we'll really get into chapter 20, and on Thursday we will have a quiz on confidence intervals in class. I'll be after school tomorrow to review and study for the quiz if you have questions.

Please return both your SSS forms and your AP REGISTRATION paperwork this week.

Tonight (Tuesday) HW:
Page 448: 28, 29, 31, 38

Page 469: 1,2

Presidents Day Weekend

It was really a nice opportunity to see the entire AP student cohort in one room; it's rare we get to have you all together. You guys truly do incredible things for our school within these college level courses; just know that all your teachers appreciate your hard work and want to work equally hard to help you succeed. And that absolutely 100% includes me. I truly believe you can all beat this exam--so if you're up to the challenge, let me know anything I can do to help you (including spending mucho time reviewing after school/in study halls/lunch).

Anyway, off the soap box. You should complete the "Chapter 19 Quiz A/Quiz C" worksheet for Tuesday, as well as find the answers/take some notes from the grading rubric for the two AP problems you did with the sub.

Annnnnd....GET YOUR AP EXAM PAPERWORK IN! JUST BRING IT TUESDAY SO YOU DON'T HAVE TO WORRY ABOUT IT!

Thursday HW: Confidence Intervals

For homework, complete the following--and make sure you show the work for each problem, because I plan on checking this tomorrow while you are working on a 3 question multiple choice pop quiz. It'll be like number 18 we worked through on the board; you'll need to find the mean and standard deviation for a sampling distribution and then use a Normal model.

Tonight, complete the following:

Page 446: 3, 7, 11, 15, 17

Don't forget to find the answers to the two AP Problems from Monday (with the sub) and write up the correct solutions for Tuesdsay.

Wednesday HW (Sorry I slacked on the blog yesterday)...

Tonight you need to read chapter 19--and I'd recommend you take notes b/c we definitely have a reading quiz...

Tomorrow it's back to the beauty that is chapter 19 and confidence intervals. I CAN'T WAIT!

Weekend HW

Alright, alright--I'll go easy on you this weekend. But it's gametime as soon as you walk in this classroom on Monday. I can't wait--it's statistical inference time!

Your homework this weekend is to complete the 5 multiple choice questions provided in class. These will count as part of your TEST GRADE. Each will be worth 2 points--1 point for the answer, 1 point for showing your work.

SO IF YOU DON'T SHOW WORK, YOU"LL AT BEST GET A 50!

Number 16 Hint: The standard deviation in this question is difficult to find. First, you need to find the separate standard deviations for the Holiday and Dynamite mints using the binomial standard deviation formula. (square root of npq). Then, you need to use our rules for variances to get the standard deviation of these two mints together.

Thursday HW: STUDY!

EXTRA CREDIT OPPORTUNITY: This is very short notice and I apologize, but tomorrow I'll be heading to the underclassmen math classes to promote the wonderful world of AP mathematics at our school. If you remember when I came to your class, I had some letters written by current students for incoming students.

You can earn some test points for tomorrow (+5) if you write a letter to incoming students (for Stats and Calc next year), the only issue is it must be emailed to me tonight. The letter should be 1/2 to a full page (max). Simply talk about your feelings on AP Statistics--would you recommend it? Is it interesting? How's the teacher? How hard is the course and how much work is it? Is it a lot different than your previous math classes? Do you think this will better prepare you for college? What are some advantages of taking AP in general? Please be honest--don't only say good things, mention any fallbacks as well.

Calculus students--I could use some Calc letters as well, so feel free to write about Calculus rather than Stat (I'll still give you extra credit), or a combination of the two.


I've attached some questions below for you to check out--work on these and prepare yourself for tomorrow's test!

Page 384 # 35, 38, 40, 16, 18, 6
Key:
6.) b. mean = 3.44, c. mean = 17.20

16.) a. mean=2.25 b. SD=1.26

18.) b. mean=89 c. SD=260.54

38.) a. mean=37.6, SD=3.7 b. z = -2.07, prob = 0.019

40.) a. Profit = 120B+150D-200 b. mean =928, SD=187.45 d. Independence must be assumed

Page 402: #4, 7, 36, 37
Key:
4.) mean = 100, SD = 9.95; check success/fail, bernoilli trials, 10% condition; since this is nearly 10 SD above the mean the probability is essentially zero

36.) a. 0.5929 b. 0.4071 c. 0.0529 d. 0.0025

Tuesday HW!

Page 398:
21, 25, 29, 31

I need to see lots of work for credit; if you just have a bunch of answers, 0 it is.

Check out this UConn article...

Here's a link to the article written by Stephanie Summers for the UConn "Spotlight" if you're interested. Crytal--you're in the picture! Maybe you'll be famous!

http://spotlight.education.uconn.edu/2011/carofano-odds-are-with-all-american-stats-teacher/

Monday's HW

Tonight you should complete the problems identified in class on our powerpoint slides. I've provided the answers below--if you want full credit, just the answers won't cut it! You need to show work!

1. "O negative blood" We expect to examine 16.667 donors; P(first universal donors is one of first four people) = 0.21925

2. "Suppose 20 donors..." b. We can assume independence because 20 donors is less than 10% of all blood donors. c. Mean = 1.2, St. Dev = 1.06; d. P(2 or 3 universal donors) = .311

3. "Colorblind Males"

• On average, a person should expect to ask 12.5 people to find one colorlind male.
• P(no colorblind among first 4 men) = 0.7164
• P(first CB on 6th person) = .0527
• P(CB on 1st or 2nd or 3rd....or 9th or 10th) = .5656

4. Olympic archer

• P(first bull on 3rd shot) = 0.032
• P(at least one bull) = 0.999936
• P(first bull on 4th or 5th) = 0.00768
• P(exactly 4 bullseyes) = 0.24576
• P(at least 4 bullseyes) = 0.90112
• P(at most 4 bullseyes) = 0.34464

5. Can we use probability models...we'll discuss in class

6. "Left Handed people"

• P(first lefty is 5th) = 0.0745
• P(some lefties) = 0.502
• P(lefty is 2nd or 3rd) = 0.2115
• P(exactly 4 lefties) = 0.0012
• P(at least 3 lefties) = 0.0179
• P(no more than 2 lefties) = 0.982