The Average Cost of Tuition, Room and Board at Community $\alpha$

Multiple Choice

The average cost of tuition, room and board at community colleges is reported to be $8,500 per year with a standard deviation of $1,200, but a financial administrator believes that the average cost is higher. A study conducted using 150 community colleges showed that the average cost per year is $9,000. Let $\alpha$ = 0.05. What is the critical z-value for this test?

A) +1.96
B) -1.96
C) +1.65
D) -1.65