PISA 2012 Released Items
Question 1: DRIP RATE
PM903Q01 – 0 1 2 9
A nurse wants to double the time an infusion runs for.
Describe
precisely how
D
changes if
n
is
doubled
but
d
and
v
do not change.
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DRIP RATE SCORING 1
QUESTION INTENT:
Description: Explain the effect that doubling one variable in a formula has on
the resulting value if other variables are held
constant
Mathematical content area: Change and relationships
Context: Occupational
Process: Employ
Full Credit
Code 2: Explanation describes both the direction of the effect and its size.
•
It halves
•
It is half
•
D will be 50% smaller
•
D will be half as big
Partial Credit
Code 1: A response which correctly states EITHER the direction OR the size of the
effect, but not BOTH.
•
D gets smaller
[no size]
•
There’s a 50% change
[no direction]
•
D gets bigger by 50%.
[incorrect direction but correct size]
No Credit
Code 0: Other responses.
•
D will also
double
[Both the size and direction are incorrect.]
Code 9: Missing.
