1. A tabular arrangement of data that
shows the frequency of occurrence
of the different values of the
variables.

2.  It is use to rank the disorganized data
from highest to lowest or vice versa.
 It is use to organize tabulation of the no. of
the individual scores located in each
category X for score and f for the
frequency.
 It is use to summarizes the distribution of
the values.

3.  Class interval - the range of such class of data
is called the Class Interval.
 Class limit - The lower and upper limits of a
class interval are known as Class Limits.
 Class boundaries – the values between the
upper limit of one interval and the lower limit of the
next interval.
 Class mark - Midpoint of a class interval.
 Class frequency - Refers to the number of
observation belonging to a class interval.
 Class size - the total number of observations on
which class interval is formed.

4.  Problem A: Using following data, construct a
frequency distribution table of weight of 50 boys. Use
8 class intervals of equal size and also find class
boundaries and mid class. 125, 108, 119, 115, 129,
140, 137, 130, 129, 124, 111, 100, 127, 130, 150, 96,
141, 122, 122, 136, 92, 124, 139, 109, 105, 114, 131,
124, 136, 132, 151, 127, 125, 123, 119, 124, 134,
129, 104, 102, 125, 148, 143, 124, 123, 101, 147,
100, 126, 131.


5.  Ascending Order:
92, 96, 100, 100, 101, 102, 104, 105, 108, 109,
111, 114, 115, 119, 119, 122, 122, 123, 123, 124,
124, 124, 124, 124, 125, 125, 125, 126, 127, 127,
129, 129, 129, 130, 130, 131, 131, 132, 134, 136,
136, 137, 139, 140, 141, 143, 147, 148, 150, 151.

6. Range = Largest Observation - Smallest
Observation
Here,
Largest Observation = 151
Smallest Observation = 92
Range = 151 - 92 = 59

7. From the problem we use 8 class intervals of
equal size and the range for the given data is 59,
so in order to find the size of class interval.
The formula will be;
Size of class interval = Range
Total no. of class intervals
Size of class interval = 59/8 = 7.375 = 8
(note: in case the fraction appears, the next higher
whole number is usually taken as the size of the
class interval).

8. Weigh t Tally frequency
92-98 II 2
99-106 IIIII I 6
107-114 IIII 4
115-122 IIIII 5
123-130 IIIII IIIII IIIII III 18
131-138 IIIII II 7
139-146 IIII 4
147-154 IIII 4

10. Prepared by : Ms. Ma. Teresa B. Berondo
Prof.: Maria Fe Gueta
Inferential Statistic