ANSWER A-C PLEASE Do one of the following, as appropriate. (a) Find the critical

Question

ANSWER A-C PLEASE

Do one of the following, as appropriate. (a) Find the critical value z/2. (b) find the critical value ta/2. (c) state that neither the normal nor the t distribution applies. Confidence level 98%; n = 20; is unknown; population appears to be normally distributed Click here to view a table of critical t-values Click here to view page 1 of the standard normal table. Click here to view page 2 of the standard normal table B./22.205 oc. w2#2539 D. zu/2-2055 E. Neither normal nor t distribution applies.

Explanation / Answer

As the standard deviation is unknown here, therefore t -distribution would be used here.

For n-1 = 19 degrees of freedom, we get for 98% confidence interval that:

P( -2.539 < t19 < 2.539 ) = 0.98

Therefore the critical t value here would be given as 2.539

Therefore C is the correct answer here.

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