Plot x against y, with a line of best fit, its equation and R² - here in this tab, with nothing uploaded.
Scatter plots are for research data and coursework - measurements you may not be ready to share. The plot and the regression are computed in your browser.
Ordinary least squares, the same as Excel's trendline and LINEST. The slope, intercept, R² and correlation coefficient r are shown below the plot.
Yes. Add more y columns, or use four columns - name, x, y, group - to colour points by group, each with its own trend line.
How much of the spread in y the straight line explains, from 0 (none) to 1 (all of it). It says nothing about cause.
PNG at twice the screen size, for documents and slides; SVG, a vector file that stays sharp at any size and opens in Illustrator, Figma, Inkscape or PowerPoint; or copy the image and paste it straight into a doc or a chat.