Calculate the Appropriate Test Statistic $z = - 1.56$ B $z = - 2.57$

Short Answer

Calculate the appropriate test statistic.
-A company manufacturing computer chips finds that 8% of all chips manufactured are
Defective. In an effort to decrease the percentage of defective chips, management decides
To provide additional training to those employees hired within the last year. After
Training was implemented, a sample of 450 chips revealed only 27 defects. A hypothesis
Test is performed to determine if the additional training was effective in lowering the
Defect rate. The correct value of the test statistic is A. $z = - 1.56$
B. $z = - 2.57$
C. $z = 1.56$
D. $z = 1.96$
E. $z = - 2.57$