Based on the U.S. data for 1965-IQ to 1983-IVQ (n = 76), James Doti and Esmael Adibi25
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Ŷt = - 10.96 + 0.93X2t - 2.09X3t
t = (- 3.33) (249.06) (- 3.09)
R2 = 0.9996
F = 83,753.7
where Y = the PCE ($, in billions)
X2 = the disposable (i.e., after-tax) income ($, in billions)
X3 = the prime rate (%) charged by banks
a. What is the marginal propensity to consume (MPC)-the amount of additional consumption expenditure from an additional dollar's personal disposable income?
b. Is the MPC statistically different from 1? Show the appropriate testing procedure.
c. What is the rationale for the inclusion of the prime rate variable in the model? A priori, would you expect a negative sign for this variable?
d. Is b3 significantly different from zero?
e. Test the hypothesis that R2 = 0.
f. Compute the standard error of each coefficient.
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