The POST Dispatcher Test Penalises Wrong Answers

Most aptitude tests you will sit reward guessing. If there is no penalty for a wrong answer, the correct strategy on a question you cannot answer is to pick something, because a blank is worth nothing and a guess is worth something.

The POST Entry-Level Dispatcher Selection Test Battery is not one of those tests, and candidates who carry the usual advice into it lose marks for no reason.

What POST actually says

From the Examinee Guide: "there is no advantage to guessing at random. A fraction of a point will be subtracted from your test score for each wrong answer. Leaving an item blank will not count towards or against your score."

The guide works the arithmetic through in a footnote. On a four-option question, random guessing on four items would be expected to produce one correct and three incorrect. You gain a point for the correct one and lose a third of a point for each of the three wrong ones — "so your net gain would be 0 points for those 4 items."

What follows from that

The expected value of a purely random guess is zero. Not negative, but not positive either — which means blind guessing cannot help you and costs you time you could spend on a question you can actually answer.

The important corollary is the one people miss: the penalty is calibrated to random guessing, so an informed guess is still worth making. If you can eliminate even one of four options, your odds move to one in three while the penalty stays at a third of a point, and the expected value turns positive. Eliminate two and it is clearly worth answering.

So the rule is not "never guess". It is:

• No idea at all, cannot eliminate anything — leave it blank and move on. A blank is free.
• Can rule out one or more options — answer it. The maths is now in your favour.
• Running out of time on a speeded test — do not fill the remaining bubbles at random. That is the one habit that actively costs you points elsewhere and gains nothing here.

Why the speeded tests make this matter more

Several tests in the battery are deliberately built so that nobody finishes. The guide is unusually candid about it: some tests are given with very short time limits "where speed of response is important", and "you should not be alarmed or discouraged if you are sometimes unable to keep up with the rapid pace of the speeded tests — they are designed to test your limits by working up to a pace where no one can keep up."

On a test you are not meant to finish, the temptation to blanket-fill the tail is strong, and on this battery that is pure waste. Unanswered items at the end of a speeded test are expected. They are what the design is for.

How the penalty feeds into your score

The penalty is applied before standardisation, not after. Your raw score on each test is "correct responses (minus a fraction of incorrect responses)", and that adjusted figure is then converted to a standard score against a norm sample of over a thousand applicants and dispatcher academy students. The eleven standard scores are summed and the total is standardised again.

Two consequences. First, all eleven tests carry equal weight: the guide says "each test in the battery receives equal weight in contributing to your total test score", so there is "no advantage to trying harder on one test than another". Second, because you are scored against other examinees rather than against a fixed mark, points thrown away on random guesses are points given to everyone who did not throw them away.

What the agency does with the number

POST does not set a universal pass mark, and neither do we. The guide states that "individual hiring authorities may use the Test Battery somewhat differently" — some apply a minimum score above which all candidates go forward equally, others combine the battery score with other assessments, and your final score may be converted to fit the agency's own process. If you need to know how your result will be used, POST's advice is to ask the hiring agency.

Practising the habit

The skill worth building is not guessing technique. It is knowing quickly whether you can eliminate an option, so that you either commit or move on without burning fifteen seconds deciding. That is a pacing habit, and it comes from doing timed sets rather than from reading about it.

Our evaluating facts, prioritisation and reading comprehension drills are timed for that reason. The POST battery guide covers all eleven sub-tests, and how dispatcher scores work covers scoring across the different batteries.

The Examinee Guide is dated February 1996 and is the document POST publishes for candidates. Confirm the current arrangements with the agency testing you.

Sources

• California Commission on Peace Officer Standards and Training, POST Entry-Level Dispatcher Selection Test Battery: Examinee Guide (February 1996)
• California Commission on Peace Officer Standards and Training, Public Safety Dispatcher Entry-Level Test Battery: Applicant FAQs

The POST Entry-Level Dispatcher Selection Test Battery is administered by the California Commission on Peace Officer Standards and Training. DispatchDrills is an independent practice provider and is not affiliated with, endorsed by, or sponsored by California POST. We do not reproduce exam content; every example in our material is original and illustrative.

Common questions

Is there negative marking on the POST dispatcher test?

Yes. POST subtracts a fraction of a point for each wrong answer. A blank item neither adds to nor subtracts from your score.

Should I guess on the POST dispatcher test?

Not at random — the expected value is zero. If you can eliminate at least one option, answering becomes worthwhile.

Should I fill in the remaining answers when time runs out?

No. Random answers gain nothing on average, and several tests are designed so that nobody completes them.

Do all eleven tests count equally?

Yes. POST states each test receives equal weight, so there is no advantage in trying harder on one than another.

What score do I need to pass?

There is no universal pass mark. Individual hiring agencies decide how to use the battery, and POST directs candidates to ask the agency.