How to Find Critical Values on TI-84

If you’re preparing for any math-related exams, you might need to understand how to find critical values on a TI-84 calculator. Whether it’s for a Z-test, T-test, or confidence interval, the TI-84 makes it easy to calculate these values accurately.

Want to try these steps while learning? You can use our TI-84 Plus emulator – no download needed to practice calculating critical values directly in your browser.

1. How to Find Z-Critical Value on TI-84 (Standard Normal Distribution)

1. Press 2nd
2. Press VARS (to open the DISTR menu)
3. Select 3:invNorm(
4. Enter: invNorm(area, 0, 1)
5. Press ENTER
   

2. How to Find T-Critical Value on TI-84 (Student’s t-distribution)

1. Press 2nd
2. Press VARS (to open the DISTR menu)
3. Select 4:invT(
4. Enter: invT(area, degrees_of_freedom)
5. Press ENTER
   

3. Use Z-Test or T-Test (for Hypothesis Testing)

1. Press STAT
2. Arrow right to TESTS
3. Select 1:Z-Test or 2:T-Test
   1. Use Z-Test (when σ is known)
   2. Use T-Test (when σ is unknown)
      
4. Enter the required values
5. Scroll down to Calculate
6. Press ENTER
   

Understanding hypothesis testing becomes much easier when you also know how to calculate Z-scores using a TI-84 Plus calculator.

4. Use Confidence Intervals (to get critical values indirectly)

1. Press STAT
2. Arrow right to TESTS
3. Select 7:ZInterval or 8:TInterval
4. Enter the required values
5. Scroll down to Calculate
6. Press ENTER

What Is a Critical Value?

A critical value is a number that marks the borderline between common and rare results in statistics.
It tells you how far a result has to be from the average to be considered statistically significant.

If your test result goes past the critical value, it means the result is too unusual to be random, so you might reject the null hypothesis.

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