Question: what does a non linear line mean according to this: The scatter plot shows the relationship between age at rehab and the outcome variable Post_6mnwalk,

what does a non linear line mean according to this: The scatter plot shows the relationship between age at rehab and the outcome variable Post_6mnwalk, as it measures the effectiveness of the rehabilitation. If the points form a straight line, the relationship is linear. If not, the relationship is not strictly linear

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