Posts In November, 2010

Unit 2; Chapters 7-9
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Tuesday November 30, 2010

Skill 9.2. Recognize and report any unusual points in a data set
Leverage, Influential, Large Residual?
  • For each point identified, determine if it is of high leverage, influential, or neither
  • Text in answers to participate in poll



Monday November 29, 2010

Skill 9.2. Recognize and report any unusual points in a data set
1. Get a laptop and open Fathom
2. Create a scatterplot of 4 points that has a correlation very close to 0
3. Place a new (5th) point on the scatterplot that....
  • Makes the |correlation| much closer to 1
  • Keeps the correlation approximately the same
  • Changes the slope of the regression line to be positive
  • Changes the slope of the regression line to be negative
  • Keeps the slope of the regression line the same
4. New scatterplot that has a positive, relatively strong relationship (approximately 15 values)
  • Add in a point that drastically reduces the correlation
  • Add in several points that do not drastically reduce the correlation
  • Focus on changes in slope of the regression line for the above scenario
Homework
Read about Influential and Leverage Points in Chapter 9 (pgs203-207)
Read "How to Interpret a Regression Output" (pg 188)


Tuesday November 23, 2010
Which School Would You Choose to Attend?

Pennies on the Ruler


Monday November 22, 2010

Reassessment Day
  • Reassessors: Take your reassessment
  • Non-reassessors: Your choice
    • Organize skill pages of the Wiki
    • Collect data on two variables in a Google spreadsheet and share it with Mr. C on Google Docs
    • Wrapup of your Linear Regression partner project - there is really no reason it should not be done by today (11/22/2010)
    • Gather resources to add to the Learning Resources page
      • Other teachers wikis
      • College level statistics course websites
    • Consolidate one of the discussions on technology into a class policy on uses of laptops, cell phones, and the Promethean board
      • Post in the Norms & Regulations page

Big thanks to Fenix1010 for starting to organize the skills pages(Unit I & Unit II) for us! If you are not reassessing, check them out, and start to organize content from this page(the Home page) into the appropriate skill page. Sign in to Wikispaces, go the page you want to edit, and click edit to start organizing our Wiki into an online textbook.



Friday November 19, 2010

Skill 8.2: Interpret a regression equation
-Hey guys this is another non Mr. C post but again if anyone has some free time after their projects and homework, feel free to edit and help out Skill pages to help fellow classmates to extend their knowledge on skills that you might have a stronger handle on, and lets continue to make this site more independent on its students rather than Mr. C posting everything. Thanks for the help.

Linear Regression Wrapup
Homework
Read R-squared - 1st paragraph and interpretation. Think about what we talked about today



Thursday November 18, 2010

Skill 8.1: Know how to find and use a regression equation for the relationship between two variables
Skill 8.2: Interpret a regression equation
Y-intercept of a regression line using summary statistics
R-squared
-Hey guys this is not a post from Mr. C but I am a student in one of his classes and I am making a few pages for each skill and this will be the link for each of them if you guys want to see what i have done so far and please feel free to edit or add anything new and fix any mistakes. Thank you. Skill 2.1, Skill 2.2, Skill 3.1, Skill 3.2, Skill 3.3, Skill 4.1, Skill 4.2, Skill 5.1, Skill 5.2, Skill 5.3, Skill 5.4, Skill 5.5, Skill 5.6, Skill 6.1, Skill 6.2, Skill 6.3, Skill 6.4, Skill 7.1, Skill 7.2Note* Some of these links are incomplete so I will try to finish them or if some people won't mind finishing some of them that would be helpful to you and the class, so lets try to make a class effort to help each other learn.
  • Awesome job! Check out the skills pages and I linked to each one of them there as well
  • Also, if you are using images, provide some info as to where they came from (if you didn't create all of the data yourself)
Grading Rubrics for Assessments given back...
Ch. 6 Assessment
Ch. 6 Grading Rubric
Chapter 7 Assessment



Wednesday November 17 2010

Reassessment Fridays & Assessment Spiel
Slope of a regression line using summary statistics



Monday November 15 & Tuesday November 16, 2010

Click on the Projects link in the side menu
  • Working with one other person assigned by Mr. C
  • Today and tomorrow working in class
  • Remain in your seats, all collaboration will be done on Google Docs
  • You MUST complete the project on Google Docs
Homework
Continue to work on Linear Regression project



Thursday & Friday November 11 and 12

Ch. 8 Skills Update/Practice
Ch. 7 Skills Review
Poll Everywhere Experiment - Conditions for Fitting Linear Regression
  • Make sure you have unlimited texting
    • If not, use a neighbor's phone that has unlimited texting
  • For each scatterplot, answer the question, "Should we fit a linear regression model?"

Homework
Read Ch. 8 and focus on conditions for fitting a linear regression model



Wednesday November 10, 2010

Skill 8.2: Interpret a regression equation
Objectives
  1. Be able to write a sentence explaining what a linear equation says about the relationship between y and x, basing it on the fact that the slope is given in y-units per x-unit
  2. Understand how the correlation coefficient and the regression slope are related.
  3. Know how r-squared describes how much of the variation in y is accounted for by its linear relationship with x
  4. Be able to describe a prediction made from a regression equation, relating the predicted value to the specified x-value
Strips of Paper Data
1. Laptops and log-on: Open up Fathom
  • Attribute 1 - Actual
  • Attribute 2 - Guess
2. While waiting for them to log on, finish Free Response question
3. Guess the length of each strip of paper (in inches)
4. Record your guess in Fathom

Discussion & Self-Assessment of 2006 AP Free Response Question
  • Some time given to finish?
Homework
Read sections of Chapter 8 that deal with predictions made by a regression equation and residuals
  • Focus on using the equation of a best fit line to make predictions and evaluating those predictions for a strong and weak correlation
Complete a Chapter 7 Assessment by Monday November 8 (THIS IS NOW LATE!)
  • Click the download link if the powerpoint will not show up



Tuesday November 9, 2010

Equations of Best Fit Lines
  • Give students equation of best fit line for scatterplot in terms of z-scores
  • Have them standardize back numerically
    • Then using Variables
  • Look at a scatterplot for Toaster Regression Data to illustrate writing in context
    • Define variables
    • If you haven't entered your data (50 of you have not) please enter it here: Toaster Data Collection


Homework
Read sections of Chapter 8 that deal with slope and y-intercept of the best fit line and understand how to calculate each quantity
  • Focus on writing equations of a best fit line in terms of the variables, not just y's and x's
Complete a Chapter 7 Assessment by Monday November 8 (THIS IS NOW LATE!)



Friday November 5, 2010

Ch. 6 Skills Assessment (6.2, 6.3, 6.4)
Ch. 7 & 8 AP Style Questions / Practice

Homework
Complete a Chapter 7 Assessment by Monday November 8



Thursday November 4, 2010

Skill 7.3 - Describe the relationship between two variables
Objective - Be able to describe the direction, form, and strength of a scatter plot (relationship)
Objective - Be prepared to identify and describe points that deviate from the overall pattern
Objective - Be able to use correlation as part of the description of a scatter plot

Start of Class: Boxplot %'s
Estimating Length of Strips of Paper Data Collection

Homework
Enter the data you collected on your toaster - Toaster Data Collection
Complete a Chapter 7 Assessment by Monday November 8
Re-learn topics on the Normal Model for an assessment on skills 6.2, 6.3, 6.4 on Friday November 5
  • Specifically look at pg. 113 - 117 in the textbook
  • Odds # 1 - 30 for the basics
  • Practice textbook problems # 30 - 50 - for more challenging problems



Wednesday November 3, 2010
Skill 7.2 - Create a display for the relationship between two variables
Objective - Know how to identify the roles of the variables and to place the response variable on the y-axis and the explanatory on the x-axis
Objective - Know how to make a scatterplot by hand(for a small set of data) or with technology
Skill 7.3 - Describe the relationship between two variables
Objective - Be able to describe the direction, form, and strength of a scatterplot(relationship)
Objective - Be prepared to identify and describe points that deviate from the overall pattern
Objective - Be able to use correlation as part of the description of a scatterplot


Tedious Tasks Data Collection


Homework
Complete a Chapter 7 Assessment by Monday November 8
Re-learn topics on the Normal Model for an assessment of skills 6.2, 6.3, 6.4 on Friday November 5
  • Specifically look at pg. 113 - 117 in the textbook
  • Odds # 1 - 30 for the basics
  • Practice textbook problems # 30 - 50 - more challenging problems
Toaster Regression
  • For each setting of your toaster at home, time how long it will take to finish (record a video if necessary)
  • Get 5 or 6 measurements
  • No need to actually toast bread, but you're welcome to
  • While you wait, read your Stat book! <see above>



Tuesday November 2, 2010

NO CLASS



Monday November 1, 2010

Skill 7.1 - Know the definition and properties of correlation
Objective - Know the conditions for correlation and how to check them.
Objective - Know that correlations are between -1 and 1, and that each extreme indicates perfect linear association


Continuation of Guess the Ages Activity
  • Construct a scatterplot of z-scores in Fathom for each variable
    • Practice with formula editor
  • Describing the relationship between guess and actual
    • Direction - in general, a positive or negative correlation?
    • Form - does it appear as if the scaterplot is linear?
    • Strength - an assessment of the amount of scatter
Homework
Begin reading Ch. 7 and post in the discussion forum for the Unit II Skills Page
Cool Idea: Make this organizer in Google Docs, share it with a few other AP Stat students, and complete/edit it while you're reading/learning


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