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How to Find Z Score on TI-NSpire?

The Inverse Normal Probability Distribution Function invNorm() is used to find the z score on TI-NSpire.

invNorm(areaμσ)

where:

  • area: the given area to the left.
  • μ: population mean
  • σ: population standard deviation

Note: Finding the Z-score indicates that the given distribution is a standard normal distribution with a mean 0 and standard deviation of 1.

In this blog post, we will discuss with step by step guide how to find z score on TI-NSpire and examples.

How to use invNorm to find z score on TI NSpire

The following steps will guide us on using the invnorm function, how to calculate the Z-Score on TI-NSpire Calculator:

Step 1: Press the “menu” button and select Statistics i.e. 6th option.

Step 2: Select “Distribution” i.e 5th option.

Step 3: Now, select “Inverse Normal function” (invNorm) i.e 3rd option, and it brings up the inverse Normal wizard screen.

Step 4: Enter the given area in the area column followed by 0 for mean and 1 for standard deviation. For example, to find the z-score associated with the 0.145 area, type 0.145,0,1.

The TI-nspire will calculate the z-score associated with the given area.

Let’s discuss a few examples to find the z score for the given area on TI NSpire

Find Z-Score corresponding to the area 0.8665 Using TI-nspire

Let’s draw the normal distribution curve for area = 0.8665

find z score for area using TI-NSpire
Find Z score using TI-NSpire

The following steps will guide on how to calculate z score for the area 0.8665 on TI-nspire Calculator:

Step 1: Press the “menu” button and select Statistics i.e. 6th option.

Step 2: Select “Distribution” i.e 5th option.

Step 3: Now, select “Inverse Normal function” i.e 3rd option, and it brings up the inverse Normal wizard screen.

Step 4: Enter the given area 0.8665 in the area column followed by 0 for mean and 1 for standard deviation.

The resultant z-score for the given area is 1.1.

Conclusion: The Z-score associated with the 0.8665 area in the normal standard distribution is 1.1.

Cool Tip: Read more on how to calculate z score on TI-84 plus!

Find Z Score for the area to the right is 0.3783 on TI-nspire?

Let’s draw the normal distribution curve for the area to the right = 0.3783

Find z score for area to right using TI-NSpire
Find z score for an area to right using TI-NSpire

The following steps will guide on how to calculate z score corresponding to the area to the right is 0.3783 on TI-nspire Calculator:

Step 1: Find the area to the left in order to calculate the z score.

area to the left = 1- area to the right

area to the left = 1 – 0.3783

area to the left = 0.6217.

Step 2: Press the “menu” button and select Statistics i.e. 6th option.

Step 3: Select “Distribution” i.e 5th option.

Step 4: Now, select “Inverse Normal function” i.e 3rd option, and it brings up the inverse Normal wizard screen.

Step 5: Enter the given area 0.6217 in the area column followed by 0 for mean and 1 for standard deviation.

The resultant z-score for the given area is 0.31.

Conclusion: The Z-score associated with the 0.3783 area to the right in the normal standard distribution is 0.31.

Cool Tip: Read more on how to Calculate Z Score in Excel!

Conclusion

I hope the article on how to find z score on the TI-nspire calculator is useful to you.

invNorm (Inverse normal distribution) function is used to calculate the z score from the given area on the TI-nspire calculator.

Cool Tip: Read more on how to use the z table chart and how to find z score for the top 5th percentile of standard normal distribution.

You can find more topics about Z-Score and how to calculate z score given the area, read the z score table on the ZScoreGeek home page.

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