Friday's Sub Work

Hey everyone! Here's the plan for tomorrow's class:

You have two responsibilities for tomorrow's classwork: Ask the sub to give you both assignments at the start of class so you can go back and forth between the two.

1. Complete the chapter 18 vocab quiz!

• You will complete this as an open note assignment in class, and like today, you can work individually or in small groups
• Use the textbooks behind my desk for any vocabulary words that are not in our notes
• Look at the glossary found at the end of chapter 18

2. Complete the "Chapter 18: Sampling Distributions In-Class Examples."

• These were the problems we would have completed together to serve as our notes
• Work together to help figure each of these out (answers below)! Help to teach each other how to do these types of problems, as we'll have them on our  unit test (in a few weeks).
• Feel free to have some people teach class to get an idea of how to do these!
• Use the 2010 Free Response answer key as an example
• Here's more about each problem:
• "Statistics from Cornell's Northeast..." Question:
• a.) Answer = 0.1367
• b.) Answer = 0.00002 (or 2.395E-5) 
• You can skip the conditions for b (really we don't have a large enough sample, but we'll still use this to practice the math part)
• Question to Consider: How can we tell if a question requires us to use the standard deviation of the sampling distribution for means (formula)? Compare what each question, a and b, asks, and determine why b requires the use of the sampling distribution.
• "After hearing of the national result...." Question:
• First you must check conditions and name the sampling distribution!
• p = 0.44
• Stuck Here's one way to approach this:
• Find the z-score for the class proportion, 0.39
• Don't forget to use the standard deviation of the sampling distribution for proportions
• Answer:
• z = -1.32
• "No, she should not be surprised, as his college's proportion is fewer than 2 standard deviations below the mean." 
• Question to Consider: Why does this question require the use of the sampling distribution for proportions? What wording in the question suggests this?
• "State police believe that 70% of the drivers...." Question:
• Answer = 0.6709
• Skip the conditions! "Assume the conditions for inference have been met."
• Don't forget to name the sampling distribution
• Question to Consider: Why does this question require the use of the sampling distribution for proportions? What wording in the question suggests this?
• "Human gestation times...." Question:
• Answer = 0.1056
• Question to Consider: Why does this question require the use of the sampling distribution for proportions? What wording in the question suggests this?
• "A recent study was conducted...." AP MC Question:
• Answer = B
• Question to Consider: 
• Why does this question require the use of the sampling distribution for proportions? What wording in the question suggests this?
• How do we get b? How do I calculate this probability! (Show work)
• Which multiple choice options could I eliminate before calculating anything? Why?
• "There were 5,317 previously owned homes...." AP MC Question:
• Answer = B
• Could I choose the correct answer without actually calculating the standard deviation? How? How could I narrow down my responses?
• How do we calculate this standard deviation? 
• How do we check to be sure that the shape of the sampling distribution will be approximately Normal?
• What conditions?
• Does this scenario pass the conditions? 

Your goal today is teach one another how to calculate these probabilities! We'll see a couple stamp problems with these ideas to review, we will definitely see a problem or two using sampling distributions on our unit test (still a few weeks away), and we may have a take home quiz on this content--so be sure to put in your best effort to learn this stuff! I know you can do it!

Work hard today and have an awesome weekend! I look forward to being back in the classroom with you all on Monday!

New stuff when I'm back--CONFIDENCE INTERVALS--WOOOOOOO!!!!!