Introduction to Normal Distribution

• Go to www.socr.ucla.edu
• Click the "Distributions" tab
• In the drop-down menu on the left, select Normal Distribution

You should see something like this:

Error creating thumbnail: File missing

• This is the standard normal distribution. In this distribution, the mean, median, and mode all appear at the center. Half of the data falls into the left side of the center and half falls into the right side.
• In the picture above, the distribution has a mean of 0, and a standard deviation of 50.
• If you scroll down, you will see a box labeled "Left Cut Off" and another labeled "Right Cut Off." You can use these to find what percent of the values fall between certain values.
• Try typing -50 in the left cutoff box and 50 in the right cutoff box. This represents the area between -1 standard deviation and +1 standard deviation. You should see something like this:

Error creating thumbnail: File missing

• Notice in the green box below the graph there are several values listed. It says Between: .682689. This means that about 68.27% of the data lies between -1 and +1 standard deviations.
• It also lists how much of the data lies to the left of -1 standard deviation and to the right of +1 standard deviation.

My Activities

• JamieFife_2007_MyFirstActivity_080807

---

• SOCR Home page: http://www.socr.ucla.edu

---

---

Translate this page:

(default)	Deutsch	Español	Français	Italiano	Português	日本語	България	الامارات العربية المتحدة	Suomi	इस भाषा में	Norge
한국어	中文	繁体中文	Русский	Nederlands	Ελληνικά	Hrvatska	Česká republika	Danmark	Polska	România	Sverige