Organizing Test Scores For Statistical

Analysis (part 2)

Reference: Measuring and Evaluating Learning Outcomes in AL 1 and 2Carlito D. Garcia Ed D

ORGANIZING SCORE THROUGH STEM-AND-LEAF PLOT

ORGANIZING SCORE THROUGHSTEM-AND-LEAF PLOT

• Stem-and-leaf plot – method of graphically sorting and arranging data to reveal its distribution.

ORGANIZING SCORE THROUGHSTEM-AND-LEAF PLOT

In this method of organizing scores, a numerical score is separated into two parts, usually, the first one or two digits and the other digits. The stem is the first leading digit of the score while the trailing digit is the leaf

The following procedure should be observed in organizing and presenting test scores in a stem –and-leaf plot:

1. Split each numerical score or value into two sets of digit. The first leading set of digits is the stem, and the second or trailing set of digits is the leaf.

2. List all possible stem digits from the lowest to highest.

3. For each screw in the mass of data, write down the leaf number on the line labeled by the appropriate stem number

Let us illustrate how a stem-and-leaf plot is constructed with the us of the following periodical results in Biology.

30 74 80 57 32 40 55 59

31 77 82 59 90 51 54 62

33 46 65 49 92 69 66 41

42 50 68 48 57 71 68 59

60 53 49 63 53 44 81 68

Following the procedure is listed above, the stem-and-leaf plot aforementioned test scores in shown below.

Stem Leaf3 0 1 2 34 0 1 2 4 6 8 9 95 0 1 3 3 4 5 7 7 9 9 9 6 0 2 3 5 6 8 8 8 9 7 1 4 7 8 0 1 29 0 2

Presented by:Niel Richard C. LopezBSED-III Englich

Presented to:Doc. Ed