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Explain whether the standard normal distribution or the t -distribution is employed under the following circumstances: A) Population: Not given; Sample size: 50; Population standard

Explain whether the standard normal distribution or thet-distribution is employed under the following circumstances:

A) Population: Not given; Sample size: 50; Population standard deviation: Given

B) Population: Normal; Sample size: 16; Population standard deviation: Not given

C) Population: Not given; Sample size: 40; Population standard deviation: Given

D) Population: Normal; Sample size: 9; Population standard deviation: Given

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