Q&A for How to Find Standard Deviation on the TI–84

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I deleted L1, how can I revert it back?

Venatrixx

Community Answer

There is no way to revert lists. Unfortunately, you'll just have to enter the data again.

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How do I use a TI-84 Plus calculator?

Linnie

Top Answerer

To understand how to use a TI-84 Plus calculator, check out Use a TI‐84 Calculator (Plus, Silver and C Editions) .

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My calculator L stars at L3, how can I change it to L1?

Kyce Abdallah

Community Answer

Just press 2 and 1 and that should fix it. If that doesn't work, then just reset your calculator.

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My calculator doesn't display the frequency screen. How can I fix this?

David Reynolds

Community Answer

Ensure your calculator is in 'STAT' mode, which supports statistical functions. Check the manual or online resources to confirm if your model supports frequency functions. If it should but doesn't, try resetting it to factory settings or updating the firmware, if possible.

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What should I do if the standard deviation comes up blank on the calculator?

Community Answer

Double-check that you entered all the data correctly and ensure you selected the correct list when attempting to calculate it.

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What if the standard deviation comes up blank, with Sx showing nothing?

David Reynolds

Community Answer

If the standard deviation calculation results in a blank or undefined value, there are a few potential reasons to consider. It could be due to a lack of data points or all data points being identical, as standard deviation measures the amount of variation or dispersion in a set of values. It might also result from computational errors or incorrect application of the standard deviation formula. You should review the data set and the calculation process to identify and correct any issues.

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How do I find the variance with a TI-84 Plus?

Community Answer

There directly is no variance key on this calculator. However, to find the variance on a TI-84 Plus, calculate the standard deviation of your data set, then square that value.

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How do I find the IQR on a TI-84 calculator?

David Reynolds

Community Answer

To find the Interquartile Range (IQR) on a TI-84 calculator, first enter your data set by pressing 'STAT', then '1:Edit', and entering the data. Next, calculate the quartiles by pressing 'STAT', scrolling to 'CALC', and selecting '1-Var Stats'. Subtract Q1 from Q3, which are displayed in the output, to find the IQR.

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