Maureen McIlvoy, Owner and CEO of a Mail Order Business $\alpha$

Multiple Choice

Maureen McIlvoy, owner and CEO of a mail order business for wind surfing equipment and supplies, is reviewing the order filling operations at her warehouses.Her goal is 100% of orders shipped within 24 hours.In previous years, neither warehouse has achieved the goal, but the East Coast Warehouse has consistently out-performed the West Coast Warehouse.Her staff randomly selected 200 orders from the West Coast Warehouse (population 1) and 400 orders from the East Coast Warehouse (population 2) , and reports that 190 of the West Coast Orders were shipped within 24 hours, and the East Coast Warehouse shipped 372 orders within 24 hours.Assuming $\alpha$ = 0.05, the critical z value is ___.

A) -1.96
B) -1.645
C) 1.645
D) 1.96
E) 2.33