Scatter Plots and Trend Lines

Front

What is a scatter plot?

Back

A scatter plot is a graph that shows the relationship between two quantitative variables by displaying data points on a two-dimensional axis.

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CCSS.8.SP.A.1

Front

What does a trend line represent in a scatter plot?

Back

A trend line is a straight line that best represents the data points in a scatter plot, indicating the general direction of the data.

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CCSS.8.EE.B.5

Front

What is positive correlation?

Back

Positive correlation occurs when an increase in one variable leads to an increase in another variable.

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CCSS.HSS.ID.C.9

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What is negative correlation?

Back

Negative correlation occurs when an increase in one variable leads to a decrease in another variable.

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CCSS.HSS.ID.B.5

Front

What does no correlation mean?

Back

No correlation means there is no apparent relationship between two variables; changes in one do not affect the other.

Tags

CCSS.HSS.ID.B.5

Front

How can you predict values using a trend line?

Back

You can predict values by locating the desired input on the x-axis, then finding the corresponding output on the trend line.

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CCSS.8.F.B.4

CCSS.HSF.LE.A.2

Front

What is the line of best fit?

Back

The line of best fit is a straight line that best represents the data in a scatter plot, minimizing the distance between the line and all data points.

Tags

CCSS.8.EE.B.5

Front

How do you determine the slope of a trend line?

Back

The slope of a trend line is determined by the change in the y-values divided by the change in the x-values between two points on the line.

Tags

CCSS.8.EE.B.5

Front

What is the equation of a line in slope-intercept form?

Back

The equation of a line in slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept.

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CCSS.8.EE.B.6

CCSS.8.F.A.3

Front

What does the y-intercept represent in a trend line?

Back

The y-intercept represents the value of y when x is zero; it is where the line crosses the y-axis.

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CCSS.HSF.LE.B.5