Two independent random samples of size n₁ = 50 and n₂ = 75 are drawn from population 1 and population 2, respectively. In order for t procedures to be valid, what must the size of each population be?

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a	Population 1 must be at least 5 and population 2 must be at least 7.5.
b	Population 1 must be at least 500 and population 2 must be at least 750.
c	Population 1 must be at least 5000 and population 2 must be at least 7500.
d	Population 1 must be at least 50,000 and population 2 must be at least 75,000.
e	The size of the population doesn't matter, only the size of the sample matters.