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Calculating Range, Class Intervals, & Constructing Frequency Tables for Graphics, Lecture notes of Statistics

Arab Academy for Science & TechnologyStatistics

Instructions on how to calculate the range, find the number of classes, and construct frequency tables for frequency distributions. It includes examples and exercises to help understand the concepts.

Typology: Lecture notes

2018/2019

Uploaded on 11/27/2019

emad.hassan
emad.hassan 🇪🇬

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CHAPTER
( 2 )
Describing data
frequency distributions & graphic
presentation
(1) Range = Highest value – lowest value
(2) Find No. of classes ( K )
Where 2K > n
n : No. of observations
Range
(3) Class interval ( i ) = ــــــــــــــــــــــــــــ
K
Constructing a frequency distribution
steps :
pf3
pf4
pf5

Partial preview of the text

Download Calculating Range, Class Intervals, & Constructing Frequency Tables for Graphics and more Lecture notes Statistics in PDF only on Docsity!

CHAPTER

Describing data^ ( 2 )

frequency distributions & graphic

presentation

(1) Range = Highest value – lowest value (2) Find No. of classes ( K ) Where 2 K

n n : No. of observations Range (3) Class interval ( i ) = ــــــــــــــــــــــــــــ K

Constructing a frequency distribution

steps :

N.B:

Class interval approximate (appx.) to upper nearest unit 3.7 ~ 4 3.2 ~ 4

Construct the frequency table :

Class Lowest value

  • class interval .... till Highest value Frequency By count No. of items in each class by tallies

Ex :

Find :

Frequency distribution.

Sol :

  • Range = 84 – 18 = 66
  • No. of classes ( K ) : 2 K > 40 K = 6
  • Class interval ( i ) = 11 = ـــــــــــ 66 6 Class Frequency 18 – 29 29 – 40 40 – 51 51 – 62 62 – 73 73 – 84 // 2 /// 3 //// / 6 //// //// //// / 16 //// //// 10 /// 3 40

Find the frequency distribution