Scatterplots and Trend Lines Review

Front

What is a scatterplot?

Back

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

Front

What does a line of best fit represent in a scatterplot?

Back

A line of best fit is a straight line that best represents the data on a scatterplot, indicating the general direction of the relationship between the variables.

Front

What is correlation in the context of scatterplots?

Back

Correlation refers to the strength and direction of a linear relationship between two variables, which can be positive, negative, or none.

Front

What does a positive correlation look like on a scatterplot?

Back

A positive correlation appears as an upward slope from left to right, indicating that as one variable increases, the other variable also increases.

Front

What does a negative correlation look like on a scatterplot?

Back

A negative correlation appears as a downward slope from left to right, indicating that as one variable increases, the other variable decreases.

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.

Front

How do you determine the slope of a line from a scatterplot?

Back

The slope of a line can be determined by selecting two points on the line and using the formula (change in y) / (change in x).

Front

What is the y-intercept in a linear equation?

Back

The y-intercept is the point where the line crosses the y-axis, represented by the value of y when x = 0.

Front

What is the purpose of a line of best fit?

Back

The purpose of a line of best fit is to summarize the relationship between the variables and make predictions based on the data.

Front

What does it mean if there is no correlation in a scatterplot?

Back

No correlation means that there is no discernible relationship between the two variables, and the data points are scattered randomly.