Sol:
a).
. for x2:
If x2 increases 1 unit, y decreases by 6.1353 units
for x4:
if x4 increases by 1 unit, y increases by log(26.7552) or 1.427 units
b)
. all the variables with p-value < 0.15 are significant
variables x1, x2, x3, x4 are significant except intercept
c).
It is calculated and arranged in your image
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Consider a multiple linear regression model Y; = Bo + B1Xi1 + B22:2 + 33213 +...
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