Question: 3.9 Reconsider the data from the previous exercise. Suppose that the response data were collected on two different days. Fit a new model to the

3.9 Reconsider the data from the previous exercise. Suppose that the response data were collected on two different days. Fit a new model to the data, say, y = ßle ** + ßsz + e where z is an indicator variable with z = 0 if the observation was made on the first day and z = 1 if the observation was made on the second day. Is there any indication that there is a difference between the two days?

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