Math 8 - Scatterplots and Trend Lines (Flashcard 11.2)

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 grid.

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.

Front

How do you determine the slope of a trend line?

Back

The slope of a trend line is calculated by the formula: slope (m) = (change in y) / (change in x).

Front

What is the y-intercept in the equation of a line?

Back

The y-intercept is the value of y when x is 0, represented as 'b' in the equation of a line, y = mx + b.

Front

What does it mean if a scatter plot shows no correlation?

Back

No correlation means that there is no apparent relationship between the two variables; the data points do not follow a pattern.

Front

What is an outlier in a data set?

Back

An outlier is a data point that differs significantly from other observations in a dataset, often appearing far away from the trend.

Front

How can you identify an outlier in a scatter plot?

Back

An outlier can be identified as a point that is distant from the cluster of other points in the scatter plot.

Front

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

Back

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

Front

What does a positive slope indicate in a trend line?

Back

A positive slope indicates that as one variable increases, the other variable also increases, showing a direct relationship.

Front

What does a negative slope indicate in a trend line?

Back

A negative slope indicates that as one variable increases, the other variable decreases, showing an inverse relationship.