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Question

Because the t procedures are robust, the most important condition for their safe use is that(a) the population standard deviation a- is known.(b) the population distribution is exactly Normal.(c) the data can be regarded as an SRS from the population.

Solution

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The $t$-procedures do not require the knowledge of the population standard deviation $\sigma$.

Since the $t$ procedures are robust, deviations of normality will still be safe.

Thus the most important condition is that the sample is an SRS.

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