I strongly suggest you write the comment in Word or another program and then copy and paste it into the comment section below. This way, if the comment doesn't go through or is accidentally deleted you'll have a record of your work. Please also remember that I have to approve all comments, so it may take a while for it to show up on the blog. You don't need to resubmit it over and over.
Click on graphs to enlarge.
|Hair Length vs. Height |
Correlation Coefficient -0.58
What can we see from the above scatter plot of hair length vs. height? Is there a correlation? How strong is it? If so, is it positive or negative; strong or weak?
Height vs. Shoe Size
Correlation Coefficient 0.72
Above is the data we collected about our shoe sizes vs our heights. Can you see a relationship? Is there a correlation? If so, is it positive or negative? How strong is it? Does shoe size cause height to change? Does height cause shoe size to change? What about the foot that's 38 cm long?
|Shoe Size vs. Hair Length|
Correlation Coefficient -0.49
Finally, the above graph shows the relationship between shoe size and hair length. Is there a correlation? If so, is it positive or negative? How strong is it? The points clustered in an interesting way. What third variable which is not shown on any of the graphs might be causing the relationship between shoe size and hair length? Does correlation imply causation? Why or why not? How about that high value for Shoe Size?
And a video about ice cream and polio...