A Company Manufacturing Computer Chips Finds That 8% of All

Multiple Choice

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