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Assumptions of t distribution and normal distribution

Do one of the following as appropriate" find the critical value Zα/2, find out the critical value tα/2, or state that neither the normal nor the t distribution applies.

Assume the population is normally distributed, the confidence level is 95%, n = 12, and σ is unknown.
Which statement applies to this situation?
a) You must find the critical value Zα/2.
b) You must find the critical value tα/2
c) neither the normal nor the t distribution applies.

What is the critical value?
tα/2 = _____________ ( Round to the nearest thousandth).

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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