Lesson 8 - Shapes

# 100 written as a proportion is 1 therefore the area

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 00% written as a proportion is 1. Therefore, the area underneath the density curve and above the x-axis = 1. Histogram of GPA 30 Frequency 25 20 15 10 5 0 0 3 6 g rade point average 9 12 The Normal Density Curve A common shape of data is the bell-shaped curve. This “bell-curve” is called a normal density curve. Data that have this shape are said to be normally distributed (or sometimes called “Gaussian distributed”, but we won’t use that terminology in this class). Below is a picture of a normal density curve: 0.2 0.1 0.0 density 0.3 0.4 Normal Distribution -3 -2 -1 0 1 Standard Deviations from mean 2 3 Question: Describe the shape of data with a normal distribution. Answer: Data that are normally distributed are symmetric with one mode. : Go to page 12-2 in the Lesson Book : Learn About the Properties of Normal Models (in the “do” part, drag the flags across the curve by moving the cursor to the flags) More notes, comments, and other information: Density curves can be described with an equation. For the nor...
View Full Document

## This document was uploaded on 02/15/2014 for the course STAT 351 at Oregon State.

Ask a homework question - tutors are online