The graph portrays the decision criterion for a hypothesis test for a population mean. The null hypothesis is

=:H00

. The curve is the normal curve for the test statistic under the assumption that the null hypothesis is true. Use the graph to solve the problem. A graphical display of the decision criterion follows.

y

x

1

2

3

4

-1

-2

-3

-4

RejectH0

Do not rejectH0

RejectH0

2.748

0.003

2.748

0.003

z

Determine the critical value(s).