Official 2020 AP Stats Exam College Board Lesson #1 Confidence Intervals for Proportions (SPDC) 4_6_2020

Hi All!

That was a great lesson from Luke Wilcox!  Here are my take-aways and teacher comments:

EXAM UPDATE

• Will be done on a computer or your phone
• 2 FRQs:  #1) 25 minutes to type or write out, 5 minutes to download + #2) 15 minutes to type or write out, 5 minutes to download = 45 minutes the entire exam
• Will cover only CED UNITS 1-7 = TSP Chapters 1-10
• 4 weeks of lessons and preparation for the exam is being taught/reviewed (recorded) M-F: 2-2:45 PM in these YouTube Lessons 😊  https://www.youtube.com/watch?v=DJP20pZUZ8Q&list=PLoGgviqq4845u-QDW3bikMhC4uQsuYDpy&index=10
• Lessons: April 6-10: Units 6-7 taught first because many schools either didn’t get to these entirely or at all (we did get through most of this); April 13-May 1: Units 1-5
• AP Stats Exam Friday May 22 from 2-2:45 EST
• All resources available at Statsmedic.com/youtube
• If you need a device take the Exam go to cb.org/tech

Example 1 “Do you want to take the AP Stats Exam” constructing a 1 proportion confidence interval (4 step SPDC process) TPS section 8-2

• The name of the procedure is what we call the Inference Method (IM) 1 Prop Z-Int
• We remember the conditions by using the acronym Random Normal Independence (RNI)
• You can state something like we will assume that there are at least 3000 (300x10) AP Stats students in the testing population as your Independence step as we do in class instead of the way Luke Wilcox does it
• You can use q-hat instead of 1-p-hat in the formula if you write it
• You can report all of the data from your calculator function Stat à Test  A: 1 Prop Z-Int  in the Do step:  Notice that he clearly states that is what is needed 😊
• You can use 2^nd àVars 3: InvNorm (0.05/2) MAKE IT POSITIVE to get z* = 1.96 instead of the Z-Table as we did in class

Example 2 “Do you want to take the AP Stats versus the AP Calc Exam” constructing a 2 proportions difference confidence interval (4 step SPDC process) TPS section 10-1

• The name of the procedure is what we call the Inference Method (IM) 2 Prop Z-Int
• We remember the conditions by using the acronym Random Normal Independence (RNI)
• You can state something like we will assume that there are at least 3000 (300x10) AP Stats students and 2000 (200x10) AP Calc in the testing population as your Independence step as we do in class instead of the way Luke Wilcox does it
• You can use q-hat instead of 1-p-hat in the formula if you write it
• You can report all of the data from your calculator function Stat à Test  B: 2 Prop Z-Int  in the Do step:  Notice that he clearly states that is what is needed 😊
• You can use 2^nd àVars 3: InvNorm (0.05/2) MAKE IT POSITIVE to get z* = 1.96 instead of the Z-Table as we did in class
• The last question highlights the connection to a test in section 9-2 where zero in the interval leads to  “Do Not Reject the Null Hypothesis” since it is  statement of no (zero) difference 😊

If you can, do the homework each day (or watch the recoding at you leisure) and follow along as we learn.

As always please email me with questions, comments, thoughts.

Take care!