>Im(Price~Enginesize+RPM+Weight, data=Cars93)

call:
Im<formula = Price ~ Enginesize + RPM + Weight, data = Cars93)

Coefficients:
(Intercept)          Enginesize        RPM                    Weight
-51.793292           4.305387       0.007096        0.007271

>summary(Lm(Price~EnginesizetRPM+Weight, data=Cars93))
Call:
lm(formula = Price ~ Enginesize + RPM + Weight, data = Cars93)

Residuals :
     Min             1Q         Median       3Q                 Max
-10.511       -3.806     -0.300       1.447           35.255
Coeffcients:
                         Estimate   Std. Error    t value     Pr(ItI)
(Intercept)  -51.793292   9.106309   -5.688     1.62e-07 ***
Enginesize  4.305387     1.324961     3.249        0.00163 **
     RPM           0.007096     0.001363    5.208       1.22e-06 ***
    Weigh       0.007271  0.002157       3.372         0.00111 **

--Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' '1
Residual standard error: 6.504 on 89 degrees of freedom
Multiple R-squared: 0.5614, Adjusted R-squared: 0.5467
F-statistic: 37.98 on 3 and 89 DF, p-value: 6.746e-16



t는 모집단끼리 평균 비교하는 거 아니에여?