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QUESTION
We must use a t distribution table (not a Z or normal distribution table) when: is known and n is below 30 b. is known and n is 30 or larger c.
1. We must use a t distribution table (not a Z or normal distribution table) when:
a. σ is known and n is below 30
b. σ is known and n is 30 or larger
c. σ is unknown and n is below 30
d σ is unknown and n is 30 or larger
e. never
