For calculation of $${\chi ^2}$$, N should be at least
A. 20
B. 50
C. 40
D. 30
Answer: Option B
A. 20
B. 50
C. 40
D. 30
Answer: Option B
A. Field trails
B. Exhibitions
C. Competition
D. Fair
The intelligency, ability or efficiency can be measured by use of
A. Median
B. G.M.
C. Weighted H.M.
D. Geometric mean
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