B. Two-tailed Sample Distribution 1. Background. A two-tailed sample distribution describes a situation where the 5% cutoff is split between the two tails, resulting in 2.5% cutoff on the left and the right tails. See illustration below. 0.25% 5.25% Rejection region - Rejection region / 2 value zcn'tical zcrit'lcal 95% Acceptance region 1. Find critical value for z a} Go to page 422 in the textbook to locate the z-tables. b) Follow the guidelines under one-tailed sample distribution for nding critical value for z and answer the following questions: {i} What is the Area C value that you should be looking for? (a). {2} Where did you nd the right value? Textbook p. {b}. {3} How should you label the critical value for z in the illustration below? 0.25% .25% Rejecn region ' Rejection region / 2 value zcritical = zcritical = _I[Ci _rd} 95% Acceptance