TEKS 8.5D Using Trendlines to Make Predictions

Front

What is a trendline in a scatter plot?

Back

A trendline is a line that best represents the data points in a scatter plot, showing the general direction of the data.

Front

How can trendlines be used to make predictions?

Back

Trendlines can be extended to estimate values for data points not explicitly shown in the scatter plot.

Front

What does a positive slope in a trendline indicate?

Back

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

Front

What does a negative slope in a trendline indicate?

Back

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

Front

What is interpolation in the context of trendlines?

Back

Interpolation is predicting a value within the range of the data points using the trendline.

Front

What is extrapolation in the context of trendlines?

Back

Extrapolation is predicting a value outside the range of the data points using the trendline.

Front

What is the purpose of a scatter plot?

Back

A scatter plot visually represents the relationship between two quantitative variables.

Front

How do you determine the best fit line for a scatter plot?

Back

The best fit line minimizes the distance between the line and all data points, often using the least squares method.

Front

What is the significance of the y-intercept in a trendline?

Back

The y-intercept is the value of the dependent variable when the independent variable is zero.

Front

What does it mean if data points are widely scattered around the trendline?

Back

It indicates a weak correlation between the variables.