Paste your numbers, hit Run, and read a plain-English interpretation — not just a number. Every calculator has a “Load class data” button that drops in real numbers from our dataset so you can see what a real result looks like. These mirror exactly what you'll do in Google Sheets on exam day.
Units 3–4. Mean, median, mode, range, variance, standard deviation, and quartiles for one list of numbers.
Unit 5. How many standard deviations is a score from the mean — and what percentile is it?
Unit 6. Do two variables move together? Enter two equal-length columns.
Unit 7. Find the best-fit line (Ŷ = a + bX) and predict Y from any X.
Unit 10. Is your sample mean different from a known value (μ)? E.g., do students sleep less than 8 hours?
Unit 11. Compare two separate groups. Demo loads Festinger & Carlsmith's classic $1-vs-$20 dissonance study, hidden in our data.
Unit 12. Same people measured twice (before vs after). Demo: mood before and after a gratitude exercise.
Unit 13. Compare 3+ groups at once. Demo: does animal-compassion differ by diet (omnivore / vegetarian / vegan)?
Unit 14 — the grand finale. Two factors at once, plus the interaction. Demo loads a stereotype-threat study: math scores by gender × threat condition. Watch for the interaction.
Unit 15 (bonus). Do your observed counts match a claimed distribution? Demo: our class's diet mix vs. the national 90/7/3 split.
Unit 15 (bonus). Are two categorical variables related? Demo: gender × diet in our class data — does the meat-is-masculine stereotype survive the counts?
Unit 14. A line graph appears — you decide whether there's a main effect of the ROW variable (the lines), the COLUMN variable (the x-axis), and an interaction. Cycles through all 8 patterns; hit “Show all 8 patterns” for the complete cheat-sheet.