Eyeball-r

A scatterplot flickers into view and starts fading — estimate its correlation, set how wide a band you'll wager, and call it before it's gone.

How to play

Each round you see a scatter of points and must judge its correlation (r) from roughly -1 to +1. Slide your guess to the center of a band, choose how tight that band is, stake some coins, and CALL before the plot fades. If the true r lands inside your band you win; tighter bands and closer centers pay more.

• Eight plots per game, starting from a coin purse you grow or burn.
• Tighter bands multiply the payout but are easier to miss.
• Some plots are traps where outliers fake a trend the bulk of points don't show.

Controls

• Desktop: drag the guess, band and wager sliders, then click CALL IT.
• Phone & tablet: drag the sliders and tap CALL IT — fully touch-friendly.

Game modes

• Daily: the same seeded plots for everyone.
• Practice: a fresh randomized purse run.

Tips & strategy

• Mentally ignore one or two extreme points to judge the real cloud's tilt.
• Bet wide when the cloud is fuzzy and tight only when the line is obvious.

What you'll learn

Eyeball-r is a correlation-estimation game that sharpens your statistical intuition for scatterplots.

• Skills: correlation, scatterplots, statistical intuition
• Best for: roughly grades 8–12 (ages 13+)
• For parents & teachers: a feel for correlation by eye.

About Eyeball-r

Eyeball-r is a correlation-estimation betting game that sharpens your statistical intuition for scatterplots. It's an original free browser game built for PlayPendium.

A free, original browser game on PlayPendium — no download, no install. Browse all games →