Correlation

Scatter Plot and Correlation

1. ^[1]
   A ​ ​ ​ ​ ​ ​ ​ ​ ​ represents the ordered pairs of two variables and on a coordinate plane. This plot is called a ​ ​ ​ ​ ​ ​ ​ ​ ​ of the variables and .
2. ^[2]
   If there is a tendency for one variable to change as another variable changes, this relationship is called a ​ ​ ​ ​ ​ ​ ​ ​ ​, and it is said that there is a correlation between the two variables and .
   • ^[3]: When the value of one variable increases, the value of the other variable also tends to increase.
   • ^[4]: When the value of one variable increases, the value of the other variable tends to decrease.

• In a scatter plot with either a positive or negative correlation, the closer the points are to forming a straight line, the ^[5] the correlation. The more spread out the points are, the ^[6] the correlation. In the following diagrams, (1) shows a ^[7] correlation than (2), and (3) shows a ^[8] correlation than (4).

(1) [9] Correlation	(2) [10] Correlation	(3) [11] Correlation	(4) [12] Correlation

• On the other hand, if the relationship between and is unclear, meaning it’s not obvious whether increases or decreases as increases, there is said to be ^[13] between and , as shown in the diagrams below.

---

1. Scatter Plot ↩︎
2. Correlation ↩︎
3. Positive Correlation ↩︎
4. Negative Correlation ↩︎
5. stronger ↩︎
6. weaker ↩︎
7. stronger ↩︎
8. stronger ↩︎
9. Positive ↩︎
10. Positive ↩︎
11. Negative ↩︎
12. Negative ↩︎
13. no Correlation ↩︎