College of Business and Accountancy
Chrysanthemum St. Hansuyin Village. Talon IV, Las Piñas City
REVIEWER B.
STATISTICAL ANALYSIS
DIRECTIONS: Given the following test scores in Science, make a frequency distribution with a number of
class intervals between 10 and 15. Follow the steps below.
65
15
22
65
57
62
58
722
65
82
80
25
40
75
73
40
95
45
70
26
40
45
35
27
68
25
85
42
47
35
66
86
46
35
57
50
42
55
42
25
92
78
57
40
18
32
76
65
72
55
I.
1.
Compute the range of the data. Look for the lowest score and highest score and then get the
difference plus one, that is:
Range = HS-LS+1
2. Get the interval size(i) by dividing the range by the average of 10 and 15.
i=Range/average of 10 and 15 which is 12.5
Round off your i to the nearest whole number.
3. Construct your class intervals, start it with a core which is divisible by your interval size (i) take
note of your lowest score. If your i is 6 and your lowest score is 19 then start of 18 because 19 is
not divisible by 6. 24 is divisible by 6 but if you start at 24, 19 will be excluded. So our class
intervals start at 18-23, then 24-49 then 30-35 and so on.
4. Then get frequency/ies (f) of each interval that is how many students got a score from 18-23,
24-29 and so on.
f
30-35
2
24-29
5
18-23
3
After you finished, get the sum of the frequencies. It should be equal to N (number of cases), If
your N is 40 your ∑f should also be 40.
II. Using the same data (Science Test Scores) above, make another frequency distribution table but
with a number of class intervals between 10-20. Follow the same steps.
College of Business and Accountancy
Chrysanthemum St. Hansuyin Village. Talon IV, Las Piñas City
III. Compute the following measures for the two frequency distributions that you have constructed:
1. Mean
2. Median
3. Mode