We Must Use the T-Distribution Instead of the Z-Distribution to Calculate

Multiple Choice

We must use the t-distribution instead of the Z-distribution to calculate probabilities for real- world data sets because of what reason?

A) Sampling error causing the sample and population means to differ.
B) Sampling error causing the samples and populations to differ.
C) Uncertainty about the sample's standard deviation.
D) Uncertainty about the population's standard deviation.