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Consider the following estimated regression model: (6 marks) Yi = 1222.1250 + 245.3750 D2 + 347.6250 D3 - 62.1250 D4 Where Yi: sales of refrigerators,

Consider the following estimated regression model: (6 marks) Yi = 1222.1250 + 245.3750 D2 + 347.6250 D3 - 62.1250 D4 Where Yi: sales of refrigerators, D2, D3, D4 are dummies for the second, third, and fourth quarters of each year, taking a value of 1 for the relevant quarter and 0 for the first quarter. Note: the coefficients of D2 and D3 are statistically significant while D4 is not. What is the interpretation of the coefficients of D2, D3, D4? *

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