Question

Write down the equation that Excel fits to the data?

Answer 1

To obtain the equation Excel fits to data, enter the data into columns, create a scatter plot, add a trendline, and select 'Display Equation on chart' to show the least-squares regression line.

Step-by-step explanation:

To find the equation that Excel fits to data using least-squares regression, you must first enter your data set into Excel. Then, you create a scatter plot. After plotting the data, you can use Excel's built-in functions to calculate the best-fit line or least-squares regression line.

Here is a step-by-step method:

1. Enter your data into two columns in Excel to represent the x (independent variable) and y (dependent variable).
2. Select the data and insert a scatter plot via the Charts section in the Insert tab.
3. Click on the scatter plot, then select the 'Add Trendline' option from the Chart Tools menu.
4. Choose 'Linear' as the trendline option.
5. To display the equation on the chart, check the 'Display Equation on chart' box within the trendline options.
6. The equation will be in the form y = mx + b, where m is the slope and b is the y-intercept, rounded to four decimal places.

If you are using a graphing calculator, such as a TI-83 or TI-84, after entering your data, you can use the 'STAT' then 'CALC' functions to find the 'LinReg(ax+b)' which will give you the slope and y-intercept values for the least-squares regression line equation.