Explain Whether the Standard Normal Distribution or the T-Distribution Is

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 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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Standard normal; t-d...

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