Because the t procedures are robust the most important condi

Because the t procedures are robust, the most important condition for their safe use is that

the population standard deviation is known.

the data can be regarded as an SRS from the population.

the population distribution is exactly Normal.

Solution

Answer to the question)

T distributions are applied only when the sample size is small. Which makes it more likely to be skewed or biased.

Thus in order to reach a safe conclusion by using the T distribution , the most important condition is that the sample must be randomly selected. This ensures that no biasedness occurs and the distribution resembles the a population that appears to be normal , thus permitting the application of the T dsitribution

Hence the correct statement is: Data can be regarded as SRS from the population