Subset SelectionGuidance for Test Takers:Select the one or more options that seemto you the most likely to be correct for eachquestion. Only one is correct per question.Three marks are awarded for every correctselection, minus one for every incorrectselection.Random guesses are equally likely to resultin a lower or higher test score, so it is saferto skip questions unless you feel that youcan at least make an “educated” guess.
Subset selection yields more reliabletest scores compared with traditionalmultiple-choice tests because:1) it allows Test Takers to avoid risk rather than having to make so-called “educated” guesses,2) it discourages pure guesswork.
Consider the followingmultiple-choicequestion.Only one of the optionsA, B, C and D is correct. Most spiders have... A) 2 wings B) 4 legs C) 6 ears D) 8 eyes
Subset selection usesnegative marking; 3marks are awarded forevery correct selection,minus one mark forevery incorrectselection. Most spiders have...This discourages pureguesswork, since test A) 2 wingstakers are just as likelyto lose marks as to gain B) 4 legsmarks if they makerandom selections. C) 6 ears(See our presentationon negative marking for D) 8 eyesa fuller explanation.)
Suppose that aparticular test takerbelieves that options Aand B are bothincorrect.In a traditional test Most spiders have...they must then chooseeither C or D. A) 2 wings ✘Making a choicebetween a subset of B) 4 legsthe options like this is ✘sometimes referred toas making a so-called C) 6 ears ?“educated” guess. D) 8 eyes ?
In fact D is the rightanswer, so their markwill be +3 or -1.They might get +3 oneday, but -1 another day.This is why traditionalMost spiders have...multiple-choice testsare unreliable! A) 2 wings ✘ B) 4 legs ✘ C) 6 ears ? -1 D) 8 eyes ? +3 Score = +3 or -1
In a subset selectiontest the test takers canavoid risk by selectingall of the options theythink might be correct. MostSo in this case the test spiders have...taker should selectboth options C and D. A) 2 wings ✘ B) 4 legs ✘ C) 6 ears ✔ -1 D) 8 eyes ✔ +3
Since D is the rightanswer, their mark willbe +3 -1 = +2.Their mark will be +2whichever day theytake the test! Most spiders have...(If the right answerwas A or B, their mark A) 2 wingswould have been -2.) ✘ B) 4 legs ✘ C) 6 ears ✔ -1 D) 8 eyes ✔ +3 Score = +3 -1 = +2
To conclude, here’s the second slide again... Subset selection yields more reliable test scores compared with traditional multiple-choice tests because: 1) it allows test takers to avoid risk rather than having to make so-called “educated” guesses, 2) it discourages pure guesswork.
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