Question: 2. Recall the model with two indicator variables from question 3 of the previous homework. Calculate the hat matrix (use software if you like; it

2. Recall the model with two indicator variables from question 3 of the previous homework. Calculate the hat matrix (use software if you like; it might be faster by hand). Explain what that projection matrix does and why it makes sense, as if to someone who has taken one semester of statistics (eg. perhaps explain the relationship between this and a hypothesis test for ,u.1 = #2)

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