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

2. Parallel forms

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

3. 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

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

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

2. Ease of administration

Consider:   clear directions good printing quality

3. Ease of scoring

decide to use subjective or objective scoring what kind of answer sheet is used