Linear Correlation Flashcards
When two quantities are strongly linked together, they have what type of correlation?
high correlation
How do we know if two quantities are strongly linked together?
if the data points in the scatter plot are either on the line of best fit or close to the best fit line
What is the degree of correlation quantified by?
the correlation coefficient (r)
What is the value range for the correlation coefficient (r)?
-1 ≤ r ≤ 1
What type of relationship is there if r > 0?
a positive (increasing) relationship
What type of relationship is there if r < 0?
a negative (decreasing) relationship
The closer the value is to 0…
the more scattered the data is
The closer the value is to 1 or -1…
the less scattered the data is
What is the value of r is the data points don’t show any trend?
r = 0