Ti 83 Confidence Interval Population Mean: Overview
The TI 83 graphing calculator can help you figure out just about every confidence interval problem you come across in elementary statistics. The confidence interval is a range of data that you expect values to fall between. A simple example: you might expect your weekly paycheck to be between $500 and $600. The only difference between having “Stats” (statistics such as mean, or standard deviation) or “Data” (the actual raw, data), is that you will have to enter the data into a list in order to perform the calculation. If you don’t know how to enter the data is entered into a list, you can find the information in this article on cumulative frequency tables.
TI 83 Confidence Interval Population Mean: Steps
Confidence intervals for the population mean
Sample problem: 40 items are sampled from a normally distributed population with a sample mean (x)of 22.1 and a population standard deviation(σ) of 12.8. Construct a 98% confidence interval for the true population mean.
Step 1: Press STAT, then right arrow over to “TESTS.” Press ENTER.
Step 2: Press 7 for “Z Interval.”
Step 3: Arrow over to “Stats” on the “Inpt” line and press ENTER to highlight and move to the next line, σ.
Step 4: Enter 1 2 . 8, then arrow down to x.
Step 5: Enter 2 2 . 1, then arrow down to “n.”
Step 6: Enter 4 0, then arrow down to “C-Level.”
Step 7: Enter . 9 8. Arrow down to “calculate” and then press ENTER. The calculator will give you the result of (17.392, 26.808) meaning that your 98% confidence interval is 17.392 to 26.808.
That’s how to make a TI 83 Confidence Interval Population Mean!
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