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10 cards from this deck
A distinct group in a population sharing common traits.
Sample must reflect the same proportions as the population.
24 males (0.6 x 40 = 24) and 16 females.
Sample size = (stratum size/total population) x total sample.
9 children (34/80 x 20 = 8.5, rounded).
Adjust by reducing the largest stratum by one.
A list of population members with relevant characteristics.
It ensures all important groups are represented.
7 children (28/80 x 20 = 7).
Produces more accurate results than simple random sampling.
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