Making Predictions with Trend Lines

Front

What is a trend line?

Back

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

Front

How do you use a trend line to make predictions?

Back

You can use a trend line to predict values by extending the line and finding where it intersects with the value you want to estimate.

Front

What does it mean if a trend line does not go through the middle of the data set?

Back

It may indicate that the trend line is not a good fit for the data, making predictions less reliable.

Front

What is the purpose of a scatter plot?

Back

A scatter plot is used to display the relationship between two quantitative variables, helping to visualize trends and correlations.

Front

How can you estimate a value using a scatter plot?

Back

You can estimate a value by locating the corresponding point on the trend line for the given input value.

Front

What is interpolation in the context of trend lines?

Back

Interpolation is estimating a value within the range of the data points using the trend line.

Front

What is extrapolation in the context of trend lines?

Back

Extrapolation is estimating a value outside the range of the data points using the trend line.

Front

What does a positive slope in a trend line indicate?

Back

A positive slope indicates that as one variable increases, the other variable also increases.

Front

What does a negative slope in a trend line indicate?

Back

A negative slope indicates that as one variable increases, the other variable decreases.

Front

What is the significance of the y-intercept in a trend line?

Back

The y-intercept is the point where the trend line crosses the y-axis, representing the value of the dependent variable when the independent variable is zero.