Scatter Plots
What type of graph shows the relationship between two numerical variables?
What is a Scatter Plot
When y increases as x increases.
Positive association
What is the purpose of a line of best fit?
Show the trend of the data
A streaming service downloads 750 MB every 7 minutes.
What is the rate? y=750x + 7
What is 750
What is an outlier?
A data point far away from the rest of the data.
Each point on a scatter plot represents what?
What is x and y (a data point)
When y decreases as x increases.
Negative association
Where should most points be relative to the line of best fit?
Close to the line and balanced above and below
If x=6, Solve:
y= 8x - 4.5
What is 43.5
What is a cluster?
A group of data points close together.
If the points are grouped in one area of the graph, what is that called?
What is a Cluster
If points do not follow any pattern.
No association
Should a line of best fit go through every point? True or False
False
y= -5x+6, What is the slope?
What is -5
What is association in statistics?
A relationship between two variables.
A data point far from the others is called what?
What is an Outlier (or an Outcast)
What type of association forms roughly a straight-line pattern?
Linear association
Why is a line of best fit helpful?
It helps make predictions
If you have (12,3) and (15,9), what is the slope?
What is 2
What is the independent variable?
The variable you control or place on the x-axis.
Why are scatter plots useful?
They show relationships or trends between two variables.
What does association tell us about two variables?
How they are related or change together
A point on a scatter plot shows a student studied 4 hours and scored 85.
The line of best fit predicts 80 for 4 hours.
Question:
Which value is the actual data?
What is 85
Look at the board and solve the two-way table
18,6
7,16
25
What is the dependent variable?
The variable that changes based on the independent variable and is on the y-axis.