8.5(d) Scatter Plot Trend Line Predictions

Front

What is a scatter plot?

Back

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

Front

What is a trend line 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 use a trend line to make predictions?

Back

To make predictions using a trend line, locate the value on one axis, draw a vertical line to intersect the trend line, and then draw a horizontal line to find the corresponding value on the other axis.

Front

What does a positive trend line indicate?

Back

A positive trend line indicates that as one variable increases, the other variable also tends to increase.

Front

What does a negative trend line indicate?

Back

A negative trend line indicates that as one variable increases, the other variable tends to decrease.

Front

What is interpolation in the context of scatter plots?

Back

Interpolation is the process of estimating a value within the range of known data points on a scatter plot.

Front

What is extrapolation in the context of scatter plots?

Back

Extrapolation is the process of estimating a value outside the range of known data points on a scatter plot.

Front

How can you identify outliers in a scatter plot?

Back

Outliers are data points that fall far away from the trend line or the general cluster of data points in a scatter plot.

Front

What is the purpose of using scatter plots in data analysis?

Back

Scatter plots are used to visually assess the relationship between two variables and to identify trends, patterns, and correlations.

Front

What is the formula for calculating the slope of a trend line?

Back

The slope (m) of a trend line is calculated using the formula m = (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are two points on the line.