TEKS 8.5D Using Trendlines to Make Predictions

Front

What is a trendline?

Back

A trendline is a line that is drawn on a scatter plot to show the general direction or trend of the data points.

Front

How can trendlines be used to make predictions?

Back

Trendlines can be used to estimate values by extending the line into the future or by finding the corresponding value on the line for a given input.

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 the purpose of using scatter plots in data analysis?

Back

Scatter plots are used to visualize the relationship between two quantitative variables.

Front

What is interpolation in the context of trendlines?

Back

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

Front

What is extrapolation in the context of trendlines?

Back

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

Front

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

Back

The best fit line is determined by minimizing the distance between the line and all the data points, often using methods like least squares.

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, indicating the starting point of the trend.

Front

What is a scatter plot?

Back

A scatter plot is a graph that displays values for typically two variables for a set of data.