1 tailed test or two tailed?

[i need a brain]

A researcher would like to know if oxygen deprivation at the time of birth has a negative effect on IQ.

My Answer:

1-tailed, right? I just wanted to make sure.

& if I am using an alpha of .01, would that make that correspod with a z-score -2.33?

Thank You

[Mean Joe]

A researcher would like to know if oxygen deprivation at the time of birth has a negative effect on IQ.

My Answer:

1-tailed, right? I just wanted to make sure.

& if I am using an alpha of .01, would that make that correspod with a z-score -2.33?

Thank You

Yep sounds like a one-tailed, and that's the z-score too.