TI-84 Guides

TI-84 vs Desmos for SAT and ACT prep: honest comparison of graphing, stats, cost, and exam rules — plus which to use when.

TI-84 online vs physical: compare cost, convenience, and exam rules. Honest pros and cons of each — plus the smart way to use both.

Is the TI-84 allowed on the SAT? Yes — plus ACT, AP, and IB. See the 2026 rules for each exam and what to know on test day.

LinReg on TI-84 made simple: STAT → CALC → LinReg(ax+b). Get the equation, r, and r², graph it, and avoid the classic mistakes.

Run a t-test on TI-84 step by step: STAT → TESTS → T-Test. Learn when to use t vs z, how to read the p-value, and common mistakes.

Learn how to use normalcdf on TI-84: 2ND → VARS → 2. Includes the exact syntax, a worked example, and common mistakes to avoid.

TI-84 shows 1 instead of the answer? You used the TEST menu’s = sign. Learn why it happens and the 10-second fix.

TI-84 showing decimals instead of fractions? Press MATH → Frac to convert any answer. Learn the shortcut plus the fraction template.

TI-84 stuck on ‘Validating OS’? Fix it in 5 minutes with the reset button, a battery pull, or an OS reinstall. Step-by-step guide.

TI-84 graph not showing? Try these 5 proven fixes: check Y=, reset the window with ZOOM 6, turn off Stat Plots, fix MODE, and more.