CHARACTERISTICS OF A GOOD TEST

CHARACTERISTICS OF

A GOOD TEST

RELIABILITY : THE STABILITY OF TEST SCORES

Types of estimating reliability:

1. Test retest

            one test is administered to the same students             at least two different times

1. Parallel forms

            two different version of test at the same time are      administered to the same students

1. Two scorers

            one test is administered once to the students and      the scores are separated into two parts

1. Split half procedures

            one test is administered to the students and the         scores are separated into two parts,1^st and 2^ndpart

                       

Test retest

Administered the test twice to a group of students

Use the Pearson Product Moment Formula

(PPMF) to find the correlation coefficient of the two sets of scores 

X= first score

Y= second score

N= number of students

Parallel form

Administer two version of a test to a group of students

Find the correlation coefficient of the two sets of  scores by using PPMF

            Parallel:

1. Version 1
2. Version 2        

           

Two raters

Administer once to a group of students then it    scored by two scorers/raters

usually in a form of free test (writing/speaking)

Find the correlation coefficient of the two sets of scores by using PPMF

                       

Split half procedure

Administer the test once to a group of students

Divide the test items into two parts

Count each students scores in the two parts

Find the correlation coefficient of the two sets of scores by using PPMF

Find the reliability coefficient of the formula of the whole test by using Spearman Brown Formula

                       

VALIDILITY : THE DEGREE TO WHICH A TEST     MEASURE WHAT IT SHOULD MEASURE

Types of validity:

1. Content validity

            the content of the tets represent the content of syllabus

TABLE OF SPECIFICATION

Vocabulary Teaching Material

           

No	Topics	Noun	Verb	Adjective	Adverb
1
2

2. Empirical validity

            the test correlatewith another independent criterion             

Concurrent validity

If the test correlates with another criterion that exist at about the same time

Predictive validity

If the test can predict what will happen at the end  of the semsester

3. Face validity

            how the test “look” to the examine, examiners, test administrator, etc

            factors:

q              the language

q    the direction (instruction must be clear)

q   complete options

q   no missing words

q   good printing quality

X

PRACTICALITY

1. Ease of Economy

The more personals who must be involved in giving   the score of a test, the more costly the test becomes

1. Ease of administration

Consider:   clear directions

                        good printing quality

1. Ease of scoring

            decide to use subjective or objective scoring

            what kind of answer sheet is used