Do one of the following as appropriate A Find the critical v

Do one of the following as appropriate. A) Find the critical value za/2, b) find the critical value ta/2, c) state the neither the normal nor the t distribution applies. Confidence level 98%; n = 25; s is unknown appears to be normally distributed.
Find the critical value.
a.ta/2 = 2.492
b.ta/2 = 2.172
c.za/2 = 2.055
d.za/2 = 2.33
e.Neither normal nor t distribution applies

Solution

Answer B is correct ...

Using a t-table since n is small and ? is unknown ...

P(T > t*) = 0.05/2 = 0.025 has t a/2 = 2.069