You are the AI. Six students told you how they slept and how they
scored. Draw your best line by eye — then find out how close your eye got to the line a
computer would search out. Then try a whole year of ice-cream sales, where picking the
shape of the model matters as much as fitting it.
sinusoidal period is fixed at 12 months — drag its midline and its peak
worksheet order: estimate by eye first, reveal after (that's the Desmos step)