APUS MATH120 Week 2 Forum

APUS MATH120 Week 2 Forum
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  • Description

Topic 1: Scatter Plot, Linear Regression and R Value

  • Open excel
  • In one column enter 8 heights for 10 year old boys (inches) and in the second column enter 8 weights for 10 year old boys (pounds).  Ten year old boys height ranges from 42 inches to 62 inches while the  weight ranges from 60 to 90 pounds. You can make these up as long as they are reasonable if you do not have access to any data.  We want to see if there is a correlation.
  • Move your mouse to put a box around the numbers.
  • From the insert menu select scatter or the chart that says scatter and then select the chart at the top left on the dropdown
  • Click on one of the points
  • Select Add Trendline (Note you may need to add Trendline and then click on the line to format Trendline)
  • The default radio button is linear, keep it checked
  • Check display equation on chart and click on the display r-squared value
  • The equation is your least squares line
  • On the least squares line the slope is in front of the x value. Also, you can look at the slope of the scatter plot to see if the slope is positive. This will let you know whether to make the r value positive or negative when you take the square root of r^2.
  • If the r^2 value is say .0382 then you will click on an excel cell and type
  • =.0382^.5
  • Note the ^ key is above the 6 key
  • This will be your r value and you will make it negative if your slope is negative otherwise leave it positive.

If you have a different version of excel then you may want to search to see how to form a trendline.  These instructions work with Office 365 and Office 2010.

Then follow these instructions:

  • Attach your excel worksheet with your scatter plot, r value and regression line along with your post if possible. What did you get for your regression line? What was your r value? What did this tell you?
  • What would be a scenario where you might need to use this application?
  • Be sure to comment on at least 2 classmates.

Instructions: Your initial post should be at least 250 words. Please respond to at least 2 other students. Responses should be a minimum of 100 words and include direct questions.

To earn full credit for this forum, you must respond to at least two (2) of your peers and post your initial post by Thurs.

Initial Post Due: Thursday, by 11:55pm, ET

Responses Due: Sunday, by 11:55pm, ET.

*Only during the first week of class are assignments not due until 11:55 p.m., ET, Sunday. After Week 1, all initial posts will be due Thursday, by 11:55pm, ET.

Rubric for grading forums:   60% – Initial Post; 20% – Each Response up to 2 responses

Please sign ALL your Forum posts with the name that you like to be called – it makes it so much easier for the rest of us to address you by your preferred name when we respond.

 

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