RRB : LOCO Pilot (ALP) Exam : T-score and composite score
RRB : LOCO Pilot (ALP) Exam : T-score and composite score
Question: How are T-score and composite score of a candidate calculated in CBT mode of Aptitude Test?
Answer:
Norms and standards as laid down from time to time shall be applied uniformly to all candidates for adjudging their suitability. The basic parameters required to calculate T-score are Mean and Standard Deviation as derived from data of all candidates appeared in the test. Normally for most of the candidates, Tscore falls between T-score 80 to T-score 20, however formula does not rule out possibility of T-score beyond this range also, though number of such candidates may be very few .
The formula to calculate T-score is:
Calculation of composite score is as follows:
- As weightage to Aptitude Test is 30, the composite score of a particular subject
can be calculated as follows:
Composite T-score of a candidate having 5 tests in a battery is =300
The max T-score a candidate can obtain having 5 tests in a battery is (80x5) =400
The composite score out of 30 is:
*Out of 400 score candidate scored =300
Question: Can T-score in any test of Aptitude Test battery be negative number also?
Answer:
Yes, It is possible, since T-score is based on Mean and Standard Deviation and an individual’s particular raw score. To illustrate this, an example is given belowTotal number of questions in a test, say = 50 Mean for this test, say = 40 Standard Deviation for this test, say = 5 Suppose a candidate gets Zero score (Raw score) in this particular test then his T-score for this test will be:-
T-score = 50+10 x (0-40/5) = 50-80= -30
Normally scores of maximum number of candidates lie between 20 to 80, however, as explained above, formula for T-score does not rule out the possibility of T-score below 20 (including below Zero i.e. a negative number), though number of such candidates will be very few.
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