Lesson 8 - Shapes

So if you dropped straight down to the x axis at

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: down to the x-axis at these points, you’d be at 77 inches (one standard deviation less than the mean) and 83 inches (one standard deviation greater than the mean). Question: Below is another graph with 3 normal curves. For each curve, match the curve with the correct mean and standard deviation from the list below. choices for the mean: 20, 40, 50, 60, 70, 80 choices for the standard deviation: 5, 10, 15, 20 0.08 Normal Distribution 0.04 curve 3 curve2 0.0 0.02 density 0.06 curve 1 0 20 40 60 80 100 x Answer: Curve 1: Mean 20 standard deviation 5 Curve 2: 50 20 Curve 3: 70 10 The 68-95-99.7 Rule for Normally Distributed Data If the data follow a normal distribution, then: Approximately 68% of the data fall within 1 standard deviation of the mean Approximately 95% of the data fall within 2 standard deviations of the mean Approximately 99.7% of the data fall within 3 standard deviations of the mean Example 8.3 Suppose an observation from data that are normally distributed is one standard deviation less than the mean. Question 1: Which of the following notations would we u...
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