Q104 · Practice questionSimple familiar1 mark
QUESTION 104
A reserve contains 75% woodland and 25% wetland. An investigator can place 24 quadrats and wants proportional stratified random sampling. Which plan meets this requirement?
(A)
Place all 24 beside the access road.
(B)
Select 12 random quadrats in each habitat.
(C)
Select 18 random woodland quadrats and 6 random wetland quadrats.
(D)
Select the 24 quadrats with the greatest visible plant cover.
WORKED SOLUTION
1 markAnswer C
Answer
C
Working
Proportional allocation gives 18 woodland and 6 wetland quadrats. Random locations must be selected separately within each habitat, giving each stratum representation without convenience placement.
Marking criteria
- Select C. [1 mark]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
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