Exercise #03 - GraphPad Prism - Anscombe's Quartet

REVISED ASSIGNMENT - IMPORTANT

The goal of this assignment is for you to create your own, unique, data series, which has similar properties (Slope, Y-Intercept, and R-Square) to Anscombe's Quartet, but the data series itself must not be similar to any of the Anscombe's series.

It appears that many students copied one of the Anscombe series, made a few minor changes, and submitted this as their own work. This was an understandable confusion, but will not be acceptable for the resubmission.

Revised Rules

• Your data series must not be a copy or trivial modification of one of the four Anscombe series. Use the Anscombe series as a source of general ideas ("different ideas for how the curve could be shaped") but it is a very risky idea to copy and paste the series into your data set.
• Your data series must not be a copy or trivial modification of another student's work.
• Your work must comply with these rules and the CSUSM policy on Academic Honesty: Policy. Students re-submitting an assignment that does not meet the rules risk failing the assignment or the class and/or being reported to the Dean's office.

Revised Scoring Rules

• 1 point (bonus) for creativity : the more unique or different your series is, the better. (Be careful: If your series looks too similar to any of the Anscombe series, you run the risk of failing the assignment).
• 4 points for having an R-Squared value within 0.02 of the target, 3 points for getting within 0.02 to 0.04, and 2 points for greater than 0.04.
• 3 points for having an Slope value within 0.02 of the target, 2 points for getting within 0.02 to 0.04, and 1 points for greater than 0.04.
• 3 points for having an Y-Intercept value within 0.02 of the target, 2 points for getting within 0.02 to 0.04, and 1 points for greater than 0.04.

Revised resubmission deadline

Due Wednesday October 15th by 5pm for full credit (10 points)

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Resources

• GraphPad Prism: statistical software for Mac + Windows, student license available for all CSUSM students: Download Form
• Linear Regression using Prism : User Guide
• Download Prism Dataset (.pzf file): Psyc402-Exercise-03.pzf

The Assignment

Anscombe's Quartet is a group of 4 data sets, each of which was constructed artificially to have the same linear regression coefficients, even though they all look very different and have qualitatively different meanings. Your goal is to create your own data set which looks different from the 4, but has the same statistics. You will do this using GraphPad Prism software. Your final assignment will be to upload a PZF file to this website when finished.

Step-by-Step

1. Get a copy of GraphPad Prism statistical software. It is available on the SBSB 3125 Lab computers, or you can get a personal copy for your PC or Mac (see link above).
2. Download the Prism Data File (see above)
3. Open the Data file in Prism. You should see a section labeled "Your Name". Click it to view your data.
   
4. Try changing one of the Y values:
   
5. Now, click the graph to see how it looks:
   
6. And click the Linear Regression to see the statistics. You only need to pay attention to three values:
   • Slope : target = 0.50
   • Y-Intercept : target = 3.00
   • R square : target = 0.67
   
   
7. Try changing more of the values. You will find that it's much easier if you approach it in three stages:
   • First, adjust the Y values until the Slope is about 0.5
   • Next, adjust the Y values until the R-Square is about 0.67
   • Last, adjust the Y values until the Y-Intercept is about 3.0
8. When you are happy with the results, please clean up the assignment:
   • Change the name of Data Table from "Your Name" to your actual name - double click it and type in your name.
     
   • Change the name on Layout 1 from "Your Name" to your actual name - double click it and type in your name.
     

Turning it In

1. First, take a look at Layout 1 and make sure it shows your actual name and your actual data. Make sure any place that says "Your Name" is updated to your actual name.
2. In the Prism app, save your file (paying attention to where the file is located). Then Quit Prism. (This step is important to make sure you are uploading the final data).
3. Find your file on your computer.
4. Upload the file using the uploader here: Upload My Assignment