Question

Asked Oct 31, 2019

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Use the standard normal distribution (aka z distribution where mu = 0 and sigma = 1) to determine the values of Z that will give you the middle 95% of the data.

Note that each answer above requires TWO values of Z.

Step 1

The middle 95% of the data is,

Step 2

Hence, 0.025 in each tail.

Step-by-step procedure to obtain the values of Z that will give you the middle 95% of the data using MINITAB:

- Choose
**Graph > Probability Distribution Plot**choose**View Probability****> OK.** - From
**Distribution**, choose ‘**Normal**’ distribution. - Click the
**Shaded Area** - Choose
**Probability**and**Middle Tail**for the region of the curve to shade. - Enter the
**Probability****...**

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