Making Predictions from 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 make predictions using a trend line?

Back

To make predictions, extend the trend line beyond the existing data points and use it to estimate values for unknown data.

Front

What does a positive association in a graph indicate?

Back

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

Front

What does a negative association in a graph indicate?

Back

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

Front

What does 'no association' mean in a graph?

Back

'No association' means that there is no clear relationship between the two variables being plotted.

Front

How can you determine the weight of a person based on their height using a trend line?

Back

You can use the trend line from a height-weight graph to find the corresponding weight for a given height.

Front

What is interpolation in the context of trend lines?

Back

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

Front

What is the importance of the slope of a trend line?

Back

The slope indicates the rate of change between the two variables; a steeper slope means a greater change.

Front

How can you identify a trend line on a scatter plot?

Back

A trend line can be identified as a line that best fits the data points, minimizing the distance from the points to the line.