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Your equation would look like this: Blood Pressure = m * Salt Intake + b. Decide which of the two variables you want to predict. You will assign a number value to the other, predictive, variable. So to predict blood pressure, you would choose salt intake as the predictive variable you assign a number to.

## How can you use a trend line to make a prediction from a scatter plot?

COMMON CORE Essential question: How can you use a trend line to make a prediction from a scatter plot? When a scatter plot shows a linear association, you can use a line to model the relationship between the variables. A trend line is a straight line that comes closest to the points on a scatter plot.

## What does trendline equation mean?

Trendline equation is a formula that finds a line that best fits the data points. R-squared value measures the trendline reliability – the nearer R2 is to 1, the better the trendline fits the data.

## How do you find the equation of a trendline in Excel?

On the Layout tab, in the Analysis group, click Trendline, and then click More Trendline Options. To display the trendline equation on the chart, select the Display Equation on chart check box.

## How does excel calculate trendline equation?

Function Description

The Excel TREND function calculates the linear trend line through a given set of y-values and (optionally), a given set of x-values. The function then extends the linear trendline to calculate additional y-values for a further supplied set of new x-values.

## How do you find the equation of a trendline in Excel on a Mac?

Right click (two finger click with a trackpad) the trendline and select Format Trendline. When the box shown below appears, select Display Equation on chart and Display R-squared value on chart.