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the ISB manufacturing company is developing a regression equation to relate the monthly maintenance costs(y) of

their machines to monthly production time(x1), number of inspections per month(x2) and age of machine(x3). A random sample of eighteen machines is selected and a regression equation is fitted with partial results provided below:

coefficients p-value

intercept 353.5612 0.0149

x1 5.3650 0.1333

x2 3.4331 0.0546

x3 -5.4293 0.0425

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