Remember, your homework is about learning; it's not about earning credit, or doing it to get it done--these practice problems provide the practice you need so you can ace your quizzes, tests, and most importantly, the AP exam! We will have a quiz on two proportion z intervals and tests on Wednesday--if you do not do your homework each night you will definitely have a tough time on the quiz! Be responsible, use the resources provided, and work hard!
Here's everything homework related:
1.) This weekend please complete the rest of last night's homework--the three hypothesis test examples (shown in green on the image below)!
- You have an answer key for all of this homework--don't look at it! Try these on your own, then use the key to check your understanding! The more effort you put in now, the more prepared you'll be for Monday's classwork and Wednesday's quiz!
- Skip the conditions for the CCMMR and CC alone context--you checked these with your homework last night--so just do the rest of the hypothesis test
- You can also skip the conditions for #2 in the Obama/Trump context.
- Try the conditions for the last question, the Time magazine context about men's attitudes--these aren't on the key, so they're listed below to check.
- Conditions: Time Magazine....
- It's not stated if the samples of men 18-24 and 25-34 were selected randomly--proceed with caution.
- 129 < 10% of all men age 18-24 (in the U.S.), and 184 < 10% of all men age 25-34 (in the U.S.)
- We do not know if the samples are collected randomly, so we will assume the two (age) groups are independent of each other.
- Success Failure Condition: Two Options...
- Use p-hat for each sample (same as for a 2 prop z interval):
- (0.62)(129)>10, (1-0.62)(129)>10 and
- (0.533)(184)>10 and (1-0.533)(184)>10
- OR we can use p-hat pooled so that we're consistent with the null....
- (0.569)(129)>10, (1-0.569)(129)>10, and
- (0.569)(184)>10 and (1-0.569)(184)>10
- Here's the homework if you were out or lost yours (complete on separate paper):
2.) STAMPS are due Monday (or Tuesday, or Wednesday)--get them in!
- Today was your last stamp of the 3rd quarter! (you'll get them back Monday and can add them to your total)
- Count up all your stamps and get them together (staple them, put them in a bag, put them in an envelope, build a container---whatever works)
- Feel free to rip a stamp off a corner of a paper or show me a stamp if it's on your notes--I really only need the stamp (or you can give me the full paper, you'll get them back)--whatever works
- Double check your count!
- I will re-count for 5 randomly selected students in each class. If your total is incorrect in any way you will earn a 0...so count twice
3.) Monday's Homework: "Inference for Two Proportions" worksheet! (last practice)
- As you're working super hard to master two proportion z intervals and two proportion z tests this weekend it might be a good idea to do Monday's homework--this will give you more practice with the 2 prop z stuff AND you'll have Monday's hw done!
- Monday's HW:
And finally, here are some resources to help with your work:
- This video skips the 10% condition and doesn't show the formula with the correct numbers substituted, but does a good job otherwise in using the calculator and interpreting the interval
- Another 2 Prop Z Interval Video!
- This video doesn't use the graphing calculator for the math like we would, but otherwise is pretty good; this video interprets the interval in a different (correct) way than the first video linked
- If you find any other/better videos please send me the link to share!
- 2 Proportion Z Interval Notes/Example (Thursday's class):
- 2 Proportion Z Tests notes/example (Friday):
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