A graph that plots pairs of numerical values as dots on a coordinate plane, revealing the relationship between two variables.
Each dot is a person (or item) plotted by TWO measurements - like height on one axis and weight on the other. Patterns in the dots reveal relationships: do taller people weigh more? The scatter tells the story.
Showing a random 20 of 50 problems.
Example 1
medium
A scatter plot shows a clear curve (parabola opening up). Is a straight line a good summary?
Example 2
easy
A scatter plot of hours of sleep (x) vs. test score (y) shows points rising from lower-left to upper-right. Trend?
Example 3
medium
A scatter plot shows people's age (x) vs reaction time (y) trending upward. A student concludes aging causes slower reactions. What is the correct caution?
Example 4
medium
Should you connect the dots on a scatter plot?
Example 5
hard
A scatter plot shows random scatter around a horizontal line. Estimate r.
Example 6
medium
A scatter plot of points (1,3),(2,5),(3,7),(4,9) lies exactly on a line. What is the slope of that line and the trend direction?
Example 7
easy
In a scatter plot, where do you plot a point representing (3,5)?
Example 8
medium
A scatter plot of points (0,1),(1,3),(2,5),(3,7) lies on a line. What is the y-intercept and trend direction?
Example 9
medium
Two scatter plots both look upward sloping. Plot A's points hug a line tightly; Plot B's points are wide. Which has a higher correlation?
Example 10
medium
A scatter plot of monthly sales vs. ad spend shows a clear upward trend. A new month falls far below the trend. Possible explanations?
Example 11
medium
A scatter plot has points (1,2),(2,4),(3,6),(4,8). Describe the form and strength of the relationship.
Example 12
easy
A scatter plot of hours studied vs test score has one point far above the rest. What is this point called?
Example 13
challenge
A scatter plot has 9 points on the line y=x for x=1…9 plus one point (5,50). Qualitatively, how does adding the outlier affect a least-squares trend line's slope and intercept?
Example 14
easy
On a scatter plot of car age vs. resale value, the cloud slopes downward to the right. What does this indicate?
Example 15
medium
In a scatter of advertising spend (x) vs sales (y), points cluster tightly upward except one store with high spend and very low sales. How should you treat that point before drawing a trend line?
Example 16
medium
Given points: (1,2), (2,4), (3,5), (4,4), (5,8). Plot them and identify any outlier from the general trend.
Example 17
easy
A scatter plot shows points generally rising from lower-left to upper-right. What trend does this show?
Example 18
hard
You plot daily ice-cream sales against day-of-year. The pattern rises through summer and falls in winter. Best description of the form?
Example 19
medium
A scatter plot shows the cloud is widest at high x values and narrow at low x. What is this called?
Example 20
easy
Two scatter plots show the same upward trend, but one has points tightly along a line and the other widely spread. Which shows a stronger relationship?