Question: For the mice data, instead of modeling weight linearly over time, model weight as a quadratic function of time by including a term for days

For the mice data, instead of modeling weight linearly over time, model weight as a quadratic function of time by including a term for days as well as for days2. Which model (random intercept, random slope) and correlation structure(s) seem most appropriate for these data?

Describe your reasoning for the model you choose.

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