The multiple regression model is given as follows: Y = a + B,X, + B,X,+ D, Sales revenues per year in millions of dollars = Marketing expenditure in millions of dollars = Quality control spending in millions of dollars Y X, X, = disturbance term Regression equation: Y = 15.7 + 1.885X, + 1.925X,+ D, while p-value for X, = 0.0003 and p-value for X, = 0.1047 a. Interpret the meaning of coefficients and p-values for each independent variables from the above equation b. Estimate the sales revenues when the marketing expenditure is $15 million and quality control spending is $4.5 million c. If the R-square value = 0.6454. Interpret the meaning of this R-square!

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A: The matrix is given byTo determine: The inverse of the given matrix.Formula used:

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A: Follow step 2nd.

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A: a+bc+dc-da-b=46102⇒a+b=4  →1,  c+d=6  →2,  c-d=10  →3,  a-b=2  →4 Now adding equation (1) and (4),…

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A: We can solve this as follows:

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A: Let us first find the singular values.

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A: Solution: a. From the given information, n=26 and π=0.34.