How to write a better test
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Transcript of How to write a better test
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HOW TO WRITEBETTER TESTS
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HOW TO WRITEBETTER TESTS
A Guide for Improving Test Construction Skills
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HOW TO WRITEBETTER TESTS
by Lucy C. Jacobs, Ph.D.
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This presentation is designed to help instructors write
better tests -- better in that they more closely assess
instructional objectives and assess them more accurately.
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A number of problems keep classroom tests from being
accurate measures of students' achievement.
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A number of problems keep classroom tests from being
accurate measures of students' achievement.
Some of these problems are:
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1. Tests include too many questions measuring only
knowledge of facts.
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One of the most common complaints from students is that the test content did not reflect the material discussed in class
or what the professor seemed to indicate was most important.
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This may happen because knowledge questions are the
easiest to write.
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2. Too little feedback is provided. If a test is to be a
learning experience, students must be provided with prompt feedback about which of their
answers were correct and which were incorrect.
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3. The questions are often ambiguous and unclear.
Ambiguous questions constitute the major weakness in college
tests.
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Ambiguous questions often result when instructors put off writing test questions until the
last minute.
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4. The tests are too short to provide an adequate sample of the body of content to be covered. Short tests introduce undue error and are not fair to
students.
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5. The number of exams is insufficient to provide a good
sample to students' attainment of the knowledge
and skills the course is trying to develop.
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The more samples of student achievement obtained, the more confidence instructors have in the accuracy of their course
grades.
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WritingIDENTIFICATIO
N / SIMPLE RECALLItems
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_________The capital city of the Republic of
Indonesia
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_________The capital city of the Republic of
Indonesia
_________It is the capital city of the Republic of Indonesia.
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________What is the capital
city of the Republic of
Indonesia?
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COMPLETION ITEMS
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The completion format requires the student to
finish an incomplete statement by filling in a
blank with the correct word or phrase.
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WritingCOMPLETION
Items
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1. Omit only significant words from the statement, but do not omit so many words that the statement
becomes ambiguous.
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Poor:The Constitutional Convention met in _________ in ____________.
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Poor:The Constitutional Convention met in _________ in ____________.
Better:In 1787, the Constitutional Convention met in the city of ____________ .
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2. Use blanks of the same length throughout the test so that the length is not a
clue.
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3. Avoid grammatical clues to the correct response.
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For example, if the indefinite article a is required before a blank, use a(n) so that the student doesn't know if the
correct answer begins with a vowel or a consonant.
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4. If possible, put the blank at the end of a statement
rather than at the beginning.
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Asking for a response before the student understands the
intent of the statement can be confusing and may require
more reading time.
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Poor:_________ is the measure of central tendency that is most affected by extremely high or low scores.
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Poor:_________ is the measure of central tendency that is most affected by extremely high or low scores.
Better:The measure of central tendency that is most affected by extremely high or low scores is the _________.
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WritingMATCHING
Items
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A B
__1.
__2.
__3.
__4.
__5.
__6.
a.
b.
c.
d.
e.
f.
g.
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A B
__1.
__2.
__3.
__4.
__5.
__6.
__7.
a.
b.
c.
d.
e.
f.
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1. Use homogeneous material in each list of a matching exercise.
Using homogeneous materials requires
students to distinguish or discriminate among
things which makes for a more challenging task.
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2. Always include more responses than
questions.
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3. Include directions that clearly state the
basis for the matching. Inform students whether or not a response can be used more than once and where answers are to be
written.
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4. All the response choices must be
plausible, but make sure that there is only one correct choice for
each stem or numbered question.
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A B
__1. Eighth note
__2. Half note
__3. Quarter
note
__4. Sixteenth
note
__5. Whole note
a. 1/4 beat
b. 1/2 beat
c. 2/2 beat
d. 1 beat
e. 2 beats
f. 4 beats
g. 6 beats
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A B
__1. Eighth note
__2. Half note
__3. Quarter
note
__4. Sixteenth
note
__5. Whole note
a. 1/4 beat
b. 1/2 beat
c. 2/2 beat
d. 1 beat
e. 2 beats
f. 4 beats
g. 6 beats
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A B
__1. Eighth note
__2. Half note
__3. Quarter
note
__4. Sixteenth
note
__5. Whole note
a. 1/4 beat
b. 1/2 beat
c. 2/2 beat
d. 1 beat
e. 2 beats
f. 4 beats
g. 6 beats
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TRUE-FALSE ITEMS
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T F Jupiter is the largest planet in the solar system.
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The preceding example measures recall of a
specific fact.
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However, the following examples show how a true-false item can be
written to measure comprehension and
application.
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T F If Triangle ABC is isosceles and angle A measures 100 degrees, then angle B is 100 degrees.
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T F If a distribution of scores has a few extremely low scores, then, the median will be numerically larger than the mean.
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T F The larger the number of scores in a distribution, the larger the standard deviation of the score must be.
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WritingTRUE-FALSE
Items
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1. Test significant content and avoid trivial statements.
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2. Write items that can be classified
unequivocally as either true or false.
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3. Avoid taking statements verbatim
from textbooks.
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Poor:T F The square of the hypotenuse of a right triangle equals the sum of the squares of the other two sides.
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Poor:T F The square of the hypotenuse of a right triangle equals the sum of the squares of the other two sides.
Better:T F If the hypotenuse of an isosceles right triangle is 7cm,
each of the two equal sides must be more than 5cm.
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4. Include only a single major point in each
item.
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5. Avoid trick questions.
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Poor:T F The Raven was
written by Edgar Allen Poe.
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Poor:T F The Raven was
written by Edgar Allen Poe.
Better:T F The Raven was
written by Edgar Allan Poe.
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6. Try to avoid using words like always, all, nothing or never which
tend to make the statement false.
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Words like usually, generally, sometimes, often, some, few, may or many usually make the statement true.
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7. Avoid using negatively worded
statements.
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Poor:T F Silas Marner was not
written by Thomas Hardy.
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Poor:T F Silas Marner was not
written by Thomas Hardy.
Better:T F Silas Marner was
written by Thomas Hardy.
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8. Try to avoid long, drawn-out statements or complex sentences with many qualifiers.
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9. The number of True and False statements
should more or less be equal.
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10. Put the items in a random order so as to
avoid response patterns that could
serve as clues.
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MULTIPLE-CHOICEITEMS
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Many users regard the multiple-choice item as the most flexible and
probably the most effective of the objective
item types.
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A multiple-choice item consists of two parts:
the stem, which presents a specific problem to the test taker, and a list of possible solutions or
answers called options or choices.
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The stem may be written either as an incomplete
statement or as a question.
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The novel Les Miserables was written by:
a.b.c.
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The novel Les Miserables was written by:
a.b.c.
Who wrote the novel Les Miserables?
a.b.c.
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The followingmultiple-choice items
wereincorrectly written:
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The novel Les Miserables was written by ________.
a.b.c.
He wrote the novel Les Miserables.a.b.c.
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There should be only one correct answer, called
the key, while the other two, three or four options serve as
distractors.
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WritingMULTIPLE-CHOICE
Items
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1. The stem should fully state the problem and all
qualifications. To make sure that the stem presents a problem, always include a
verb in the statement.
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2. Include words in the stem that would
otherwise be repeated in each option. Following this
guideline not only saves time for the typist but also saves reading time for the
student.
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Poor: Sociobiology can be defined as:
a. the scientific study of humans and their relationships within the environment.
b. the scientific study of animal societies and
communication.c. the scientific study of plants
and their reproductive processes.d. the scientific study of the number of species in
existence.
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Better: Sociobiology can be defined as the scientific study of:
a. humans and their relationships within the environment.
b. animal societies and communication.c. plants and their reproductive processes.d. the number of species in existence.
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3. Eliminate excessive wording and irrelevant
information in the stem.
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Poor: Testing can contribute to the instructional program of the school in many important ways. However, the main function of testing in teaching is:
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Poor: Testing can contribute to the instructional program of the school in many important ways. However, the main function of testing in teaching is: Better:
The main function of testing in teaching is:
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4. Make sure there is only one correct
response.
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Poor:The function of the hypothesis in a research study is to provide: a. tentative explanation of phenomena. b. proven explanation of phenomena. c. framework for interpretation of the findings. d. direction for the research.
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Poor:The function of the hypothesis in a research study is to provide: a. tentative explanation of phenomena. b. proven explanation of phenomena. c. framework for interpretation of the findings. d. direction for the research.
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There is no single correct answer, because options
a, c, and d are all correct. The options
need to be reworded so that only one is clearly
best or correct …
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… or one could change the stem to read:
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… or one could change the stem to read:
According to the lecture (or the text), the most important function of the hypothesis is:
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5. Provide a minimum of three, but not more than
five, plausible and attractive options for
each item. A good procedure is to think of errors that students are
likely to make and use these as distractors.
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Poor:The 1989 research suggesting that controlled nuclear-fusion could be effected in a laboratory experiment at room temperature was conducted by: a. Watson and Crick. b. Pons and Fleischmann. c. Koch and Jenner. d. Fermi and Bohr.
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Poor:The 1989 research suggesting that controlled nuclear-fusion could be effected in a laboratory experiment at room temperature was conducted by: a. Watson and Crick. b. Pons and Fleischmann. c. Koch and Jenner. X d. Fermi and Bohr. X
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6. Make all the options for an item
approximately homogeneous in content,
form, and grammatical structure. Increasing the
homogeneity of the content among the options can
increase the difficulty of an item.
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Poor:Boyle’s law states that the absolute pressure of a given quantity of gas is:
a. inversely proportionalb. directly proportionalc. either a or bd. neither a nor b
to its volume.
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Better:Boyle’s law states that the absolute pressure of a given quantity of gas is inversely proportional to its:
a. absolute temperature.
b. volume.c. specific volume.d. weight.
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Poor:The correlation coefficient found by correlating students' scores on a classroom math test with their scores on a standardized math test is called a: a. validity coefficient. b. index of reliability. c. equivalence coefficient. d. internal consistency coefficient.
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Better:The correlation coefficient found by correlating students' scores on a classroom math test with their scores on a standardized math test is called a/an: a. validity coefficient. b. index of reliability. c. equivalence coefficient. d. internal consistency coefficient.
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7. Avoid the use of theall-of-the-above andnone-of-the-above
options.
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8. Avoid verbal associations between
the stem and the correct option, e.g., the same reference word should not appear in the stem
and an option.
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9. Use negatively-stated stems sparingly. When used, call attention to the
negative word by underlining and/or
capitalizing.
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10. Randomly distribute the correct response
among the alternative positions throughout the
test.
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That is, have approximately the same proportion of A’s, B’s, C’s, etc. as the correct
response.
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11. Concentrate on writing items that measure students’
ability to comprehend, apply, analyze, and evaluate, as well as
recall.
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WritingESSAY Items
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1. Formulate the question so that the task is clearly defined
for the student. Use words that aim the student to the approach you want them to
take.
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Words like discuss and explain can be ambiguous. If you use ‘discuss’, then give specific
instructions as to what points should be discussed.
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Poor:Discuss Karl Marx's philosophy.
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Poor:Discuss Karl Marx's philosophy.
Better:Compare Marx and Nietzsche in their analysis of the underlying problems of their day in 19th century European society.
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2. In order to obtain a broader sampling of course content, use a relatively large number of questions requiring shorter answers rather than just a few
questions involving long answers.
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3. Avoid the use of optional questions on an essay test.
When students answer different questions, they are
actually taking different tests.
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If there are five essay questions and students are told to answer
any three of them, then there are ten different tests possible.
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It makes it difficult to discriminate between the
student who could respond correctly to all five, and the
student who could answer only three.
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Use of optional questions also affects the reliability of the scoring. If we are going to
compare students for scoring purposes, then all students
should perform the same tasks.
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Another problem is that students may not study all the course material if they know
they will have a choice among the questions.
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4. Indicate for each question the number of points to be
earned for a correct response.
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If time is running short, students may have to choose which
questions to answer. They will want to work on the questions that are worth the most points.
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Essay Items at Different Levels of Bloom's Taxonomy
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Knowledge
Identify the “wage fund doctrine.”
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Comprehension
Explain the following: Aquinas was to Aristotle as
Marx was to Ricardo.
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Application
Use the "wage fund doctrine" to explain
wage rate in the writing of J.S. Mill.
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(HA) Evaluation
Using the five criteria discussed in class, critically evaluate
Adam Smith's theory of economic
development.
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THANK YOU!