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IMPORTANT: The TI-83 doesn’t have a function to calculate the t critical value directly. In other words, you won’t find it listed on a menu as something like “invT”. However, you can calculate it; it just takes a couple of extra steps.
How to Find T Critical Value on TI 83: Steps
Step 2: Press “8” for TInterval.
Step 3: Arrow right to choose STATS. Press ENTER.
- Set the mean (Xbar) to 0
- Set Sx to the square root of your sample size. The sample size is df+1, so for this example press √37.
- Set n as your sample size. For this example, it’s 37.
- Set your confidence level, which is 1 – α For this example, set it to .95.
Step 4: Highlight CALCULATE and then press Enter. The t-critical value is The same as the given confidence level limits: 2.028.
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