Researchers studied the dexterity of children using a timed test called the Functional Dexterity Test (FDT). Of

Question:

Researchers studied the dexterity of children using a timed test called the Functional Dexterity Test (FDT). Of course, they needed to allow for differences in dexterity between their subjects’ dominant and non-dominant hands. Here is a scatterplot of the speed at which subjects completed the task vs. their age, and lines for dominant and nondominant hands:

Here is a corresponding regression. The variable Dominant is 1 for trials in which a child used his or her dominant hand and 0 for trials with the non-dominant hand. Speed is recorded in tasks/second.

a) What is the proper interpretation of the predictor Dominant in this regression?
b) Are the conditions required for using an indicator variable met for these data?

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