I have a model that contains two significant interactions each composed of a dummy variable and an interval level variable (see attached). What I would like to know is if there is a way to test if one line of the interaction has a significant slope. For example, in Fig 1 of the attached, I can see the slope of the Low Status group is quite steep so perhaps it is significant. OTOH, the slope of the High Status group seems flat. Can I test whether that line has a significant slope?
Any insight is much appreciated.
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