Which Statistical Test Do I Need to Compare Two Samples

So, I am presented with a problem in which I need to compare two samples:

Sample A: is 1000 people who have blood pressure
Sample B: is 15 people who don't have blood pressure.

Do I need t-type 2 or z-type.

I also need to determine H0, H1, and statistical significance, as well as assume data for the sample and process it through SPSS and make a decision.

I want to learn this, so for now all I want is to be sure if I need t-type or z-type (I am leaning to t-type 2, as this is the only information I have).

Thank you very much!
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