This preview shows pages 1–16. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Chapter 9a (+ Supplemental Information) Statistics n Frequency Distributions n Measures of Central Tendency n Measures of Variation n Measures of Relative Standing and Boxplots x σ μ % B. Potter – ECO 3401 1 Frequency Distribution v Shows how a data set is distributed among different values B. Potter ECO 3401 Years of College Years of College Frequency 35 1 21 2 24 3 22 4 31 5 13 6 6 7 5 8 3 Total 160 B. Potter ECO 3401 Years of College Years of College Relative Frequency 21.9% 1 13.1% 2 15.0% 3 13.8% 4 19.4% 5 8.1% 6 3.8% 7 3.1% 8 1.9% Total 100% B. Potter ECO 3401 Years of College Years of College Cumulative Frequency Less than 1 35 Less than 2 56 Less than 3 80 Less than 4 102 Less than 5 133 Less than 6 146 Less than 7 152 Less than 8 157 Less than 9 160 B. Potter ECO 3401 Frequency Distribution v Shows how a data set is distributed among different values v Sometimes it’s more efficient to group data into “classes” B. Potter ECO 3401 Pulse Rates of Females and Males Original Data Constructing a Frequency Distribution 1. Determine the number of classes (should be between 5 and 20). B. Potter ECO 3401 Sturges’s Rule : Classes = 1 + 3.322[log( n )] (Round up) where: n = Number of data values Pulse Rates of Females and Males Original Data Classes = 1 + 3.322[log(40)] = 6.32 Round up to 7 n = 40 B. Potter ECO 3401 Constructing a Frequency Distribution 1. Determine the number of classes (should be between 5 and 20). 2. Calculate the class width (round up). B. Potter ECO 3401 class width (maximum value) – (minimum value) number of classes Pulse Rates of Females and Males Original Data class width (maximum value) – (minimum value) number of classes B. Potter ECO 3401 Pulse Rates of Females and Males Original Data class width 124 – 60 7 = 9.14 10 B. Potter ECO 3401 Constructing a Frequency Distribution 1. Determine the number of classes (should be between 5 and 20). 2. Calculate the class width (round up). 3. Starting point: Choose the minimum data value or a convenient value below it as the first lower class limit. B. Potter ECO 3401 Pulse Rates of Females and Males Original Data B. Potter ECO 3401 Constructing a Frequency Distribution 1. Determine the number of classes (should be between 5 and 20)....
View
Full
Document
This note was uploaded on 01/12/2012 for the course ECO 3401 taught by Professor Staff during the Fall '08 term at University of Central Florida.
 Fall '08
 Staff

Click to edit the document details