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建立人际资源圈Frequency_Distribution
2013-11-13 来源: 类别: 更多范文
Frequency Distribution
FREQUENCY DISTRIBUTION
I. Identify the problem
A randomly selected group of students in a class of 35 was asked how much allowance is given to them on a per day basis. The objective is to assess how much the average student gets on a daily basis, find how many of these students fall within a specified class interval using a frequency table, and how much the majority of the students get per day.
II. Data:
100 200 300 500 100
200 250 450 300 700
250 350 200 250 100
500 200 150 150 150
150 150 300 350 250
250 300 350 250 250
400 350 400 300 400
Allowances per day of a group of 35 students studying at DLSU
(in Php)
III. Set-up the frequency table
Class interval:
=1 + 3.322log35
=6.12 » 6
Class size:
=(700 100)/6
=100
Frequency Table
Class Limits Class Mark Class Frequency Cum. Frequency
100-199 149.5 8 8
200-299 249.5 11 19
300-399 349.5 9 28
400-499 449.5 4 32
500-699 549.5 2 34
700-799 749.5 1 35
IV. Computations for descriptive statistics
Mean:
=(8)(149.5) + (11)(249.5) + (9)(349.5) + (4)(449.5) + (2)(549.5) + (1)(749.5)
35
=Php 306.63
Median:
Median class is 200-299
=200 + 100{ [ (35/2) 8 ] / 11 }
=Php 286.36
Mode:
Php 250.00
Measures of Variability:
a. Average Deviation
= (8)|49.5-306.63|
+ (11)|249.5-306.63|
(9)|349.5-306.63|
(4)|449.5-306.63|
+ (2)|549.5-306.63|
(1)|749.5-306.63|
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