005618 14 of 24 Do one of the following as appropriate a Fin

00:5618 14 of 24 Do one of the following, as appropriate. (a) Find the critical value z/s(b) find the critical val()state that neither the normal nor the t distribution applies 0 : al c onfidence level 9096; nOIS;-17.8; population appears to be normallyditbuted Click here to view a table of critical t-values Click here to vicw pags 1 of the standard normal table Find the critical valae OA /2 1.345 O 1-1.76 OC -1.645 OD -128 Ot. Neither normal noe t distribution applies Submit Teet QuzCh10.2-3

Solution

Here, we use t distirbution [OPTION B] because we only have a small sample, n = 15 < 30.

Note that              

alpha/2 = (1 - confidence level)/2 =    0.05      
df = n - 1 =    14          

  
Therefore,

t(alpha/2) = critical t for the confidence interval =    1.761   [ANSWER, B]