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1. We must use a t distribution table (not a Z or normal distribution table) when: a. is known and n is below 30 b.

1. We must use a t distribution table (not a Z or normal distribution table) when:

a. is known and n is below 30

b. is known and n is 30 or larger

c. is unknown and n is below 30

d is unknown and n is 30 or larger

e. never

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