Thursday HW = 2 Prop Z Intervals!

Hey everyone! Let's all put in max effort--we'll be moving quickly through the rest of AP Stat, so it is essential that you are in class every day and complete all of your homework! If you do not consistently complete homework it'll be easy to quickly fall behind--2ish more months of me harassing you about this and max effort to prepare for our AP exam!

Tonight, please complete the questions shown in red (on the homework image below). (The rest will be your weekend homework, after we learn about 2 proportion z tests tomorrow). 

**Period D: Thanks to the fire drill you must use the notes slides and video linked below to help with your homework. Of course all of you are welcome to use this info to help!

• Here's some more info to help:
• First question: "Estimate the difference in survival rates for CC+MMR and CC alone..."
• Use your example from today's class! This question is very similar! 
• Remember: Conditions, Math, Interpret
• Next question (Obama, Trump initial approval ratings)
• 1.) "Estimate the difference in initial approval ratings." 
• Notice we can skip the conditions here--math and interpret!
• For the following bullets (Obama/Trump Question)....
• Based on your interval, is there evidence to suggest a significant difference in approval ratings for President Trump and President Obama?)
• Consider this: if there was no difference in approval ratings, this means the approval ratings are the same--so if we subtracted, we would get 0!
• To determine if there is a significant difference in approval ratings we need to check if our interval contains 0....
• Interval contains 0: our interval does not suggest a difference in approval ratings (because our interval suggests it's possible the difference is 0!)
• Interval does not contain 0: our interval does suggest a difference in approval ratings!
• Based on your interval, is there evidence to suggest President Obama had a higher initial approval rating?
• Consider your order of subtraction and the sign(s) (+/-) of the values in your interval.....

Here's some more stuff to help with your homework tonight:

• 2 Proportion Z Interval Video!
• 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!
• Today's note slides: