1 level of nominal IV correlate to Interval DV - how to do this?

#1
1 level of nominal IV correlate to Interval DV - how to do this in SPSS?

I have 1 categorical Iv which has 4levels - and 1 dv which is interval scores

The 4 levels of the Iv are 4likert scale responses - from "not at all"=0 to "always" =3

I want to find out if there is a relationship between only those who answered "not at all" and the dv scores. I'm not interested at all in the other 3levels of the Iv.

I am really unsure what Spss test I should be using and how to do it. If someone could explain this that would be great! I've tried everything I'm aware of and none of it makes sense

Help!

Thank you in advance :)
 
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