A researcher expects a treatment to produce an increase in the population mean. The treatment is evaluated using a one tailed hypothesis test, and the test produces z = +1.85. Based on this result, what is the correct statistical decision?

The researcher should reject the null hypothesis with a = .05 but not with a = .01.
The researcher should reject the null hypothesis with either a = .05 or a = .01.
The researcher should fail to reject H0 with either a = .05 or a = .01.
Cannot answer without additional information