Posts in April, 2011
Units 5-6; Chapter 20
-25
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Friday April 29, 2011

Demo - conducting a hypothesis test/confidence interval in Fathom
Retail T-Tests Project - Since you won't do it if I don't give you a deadline, I need it by Monday May 2
  1. 1 Sample T-test and Interval: Average price of an item at a retail store
  2. 2 Sample T-test and Interval: Difference in prices between two stores
  3. Matched Pair T-test and Interval: Mean difference between item prices

Thursday April 28, 2011

Graphing Calculator, Formula Sheet, Something to write with, something to write on
1. Using the t-model
  • finding critical values given DF, tail probability
  • finding/approximating probability
  • calculating t-scores and determining probability
2. T-intervals - estimating the true mean
  • Sample of size 26 - videos watched
  • Estimate the number of videos watched
3. Hypothesis Test - the true mean number of videos watched is 11

HOMEWORK: If you haven't watched these videos, just do it already
1. One Sample T-test (#1)
2. One Sample T-test (#2)
3. T-test Critical Value Approach
4. Differences Between Means (Excel)
5. Two Sample T-test Worked Example (please ignore the standard deviation calculation, your calculator will do this for you)
6. Paired T-tests
7. Paired T-Tests in Calculator
8. Paired T-Test and Confidence Interval


Wednesday April 27, 2011


HOMEWORK: Watch these videos as many times as you need to and come to class loaded with a list of questions
You haven't had homework all year, now you're being asked to watch videos for HW...
1. Differences Between Means (Excel)
2. Two Sample T-test Worked Example (please ignore the standard deviation calculation, your calculator will do this for you)
3. Paired T-tests
4. Paired T-Tests in Calculator
5. Paired T-Test and Confidence Interval

Tuesday April 26, 2011

Reminder: Practice AP Exam Signup
1. Data Collection - Sample Averages
  • Create a Google Doc and discuss the three different methods of data collection for each activity
    • No need to share it with Mr. C
  • The Form: Sample Means Form
  • The Data: Sample Means Data
2. Collect a sample of size 10 from each activity (walk to pool, memory experiment, bean counting)
3. The T-Model
HOMEWORK: Watch these videos as many times as you need to and come to class loaded with a list of questions
You haven't had homework all year, now you're being asked to watch videos for HW...
1. Understanding the P-value
2. Hypothesis Testing
3. Level of Significance in Hypothesis Testing
4. One Sample T-test (#1)
5. One Sample T-test (#2)
6. T-test Critical Value Approach

Wednesday April 20, 2011

1. If you didn't finish yesterday, finish Errors Assessment today
2. 2 Proportion Tests - Calculator
  • Find pairs of players that meet each condition below
    • Player 1 and Player 2 are significantly different
    • Player 1 significantly better than Player 2
    • Player 1 is not significantly better than Player 2
    • Player 1 is not significantly different from Player 2


Tuesday April 19, 2011

1. If you didn't finish yesterday, finish Errors Assessment today
  • If you were absent, complete it
  • If you did not finish, complete it
  • Missing about 15, wondering why they're not done
    • I hope it's not because you're afraid of getting a bad grade (really?)
    • Remember you can always change any grade in any marking period at any time
2. Two Proportion Z-test (Skill 22.1, 22.2, 22.4)
  • Microexpressions test: Mini-lesson
  • You try: Comparing two baseball players

  • If you don't like baseball, what are other proportions that we can compare?
  • Post your suggestions in the discussion forum on the Home page of the class wiki

Monday April 18, 2011

Errors Assessment
  • Skill 21.1 - Can you define significance?
  • Skill 21.2 - What's the relationship between a hypothesis test and a confidence interval?
  • Skill 21.3 - Define a Type I error (alpha levels)
  • Skill 21.4 - Define a Type II error (beta & Power)
  • Skill 21.5 - Power of a Test

Friday April 15, 2011

1. Errors(Part II) - using the spreadsheet from yesterday, complete a certain number of samples and deciding to Reject/FTR
  • Unlock the spreadsheet once Mr. C has given you the password
2. Create a Google Doc for yourself: you should be able to answer the following questions
  • Skill 21.1 - Can you define significance?
  • Skill 21.2 - What's the relationship between a hypothesis test and a confidence interval?
  • Skill 21.3 - Define a Type I error (alpha levels)
  • Skill 21.4 - Define a Type II error (beta & Power)
  • Skill 21.5 - Power of a Test
  • Post in the discussion forum of each skill's page if you wish to talk about it or if you have a question (don't be shy)

Thursday April 14, 2011

1. Errors(Part II) - using the spreadsheet from yesterday, complete a certain number of samples and deciding to Reject/FTR
  • Unlock the spreadsheet once Mr. C has given you the password
2. Read this: The Cost of Overemphasizing Achievement


Wednesday April 13, 2011

Complete tasks #1-4 below.
In order to get this done, you'll need to spend minimal time staring at the screen, scrolling up and down a window, and highlighting all words on this page.
1. 1st Period - finish bean counting
2. Enter Data from yesterday: Inference for Means Form
3. Errors - directions in Excel sheet - right-click and Save As... to your H: drive.

4. Read this: How to fail

Tuesday April 12, 2011

Inference For Means Data Collection
Two-Proportion Z-test: Microexpressions Test

Monday April 11, 2011

Review of Teacher Tattoos (One proportion z-test and interval)
Microexpressions - Inference for Two Proportions
  • Develop the Normal Model Parameters
  • Set the hypothesis
  • Conditions
    • Independence - need to make sure groups are independent
    • np and nq for each group
  • The test - using the model for the differences
  • Conclusion

Friday April 8, 2011


1. Microexpressions Test
2.Teacher Tattoos (One proportion z-test and interval) -
  • Check skills 20.1-20.5 and 19.1, 19.2 in the Unit V skills page for a refresher)
3. 22.1, 22.2, 22.3, 22.4: Generate and test a hypothesis about the difference between males and females at recognizing microexpressions
4. Reassessment

Thursday April 7, 2011


19.2: Share observations - post a discussion on the 19.2 Page


2. Microexpressions Test
3. Reassessment: If you'd like to reassess on Friday complete Reassessment Form found here

Wednesday April 6, 2011

19.1: Demo: Constructing a confidence interval with correct z-scores
  • 68% Confidence
  • 90% Confidence
  • 95% Confidence
  • 99.7% Confidence
For your sample proportion, calculate a confidence interval for each level of confidence
19.2: Share observations - post a discussion on the 19.2 Page
Reassessment: If you'd like to reassess on Friday complete Reassessment Form found here

Tuesday April 5, 2011

Mr. C isn't here!
Choose one of the two options:
1. Complete the Ch. 20 sections of the Unit V Assessment
2. Projects - Unit IV and Unit V

Monday April 4, 2011

Skill 19.1 and 19.2
1. Graduation Party - save the Excel sheet to your H: drive to make things easy. Directions are in the file.
  • For each sample size, create a dotplot to estimate the true proportion of people that will attend your graduation party
  • YOU decide how many different sample proportions you need

2. Working with one sample proportion to construct an interval (19.1 )
3. Interpret that interval (19.2 )

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