For age, would you expect the slope to be positive or negative? For mileage, wou
ID: 3149711 • Letter: F
Question
For age, would you expect the slope to be positive or negative? For mileage, would you expect the slope to be positive or negative? Do you still use R square (d) for measuring goodness of fit for a multiple regression model, or do you use a different statistic?
SUMMARY OUTPUT
Regression Statistics
Multiple R
0.919994279
R Square
0.846389473
Adjusted R Square
0.828317646
Standard Error
1475.432767
Observations
20
ANOVA
df
SS
MS
F
Significance F
Regression
2
203909304.7
1.02E+08
46.83475
1.22E-07
Residual
17
37007331.46
2176902
Total
19
240916636.2
Coefficients
Standard Error
t Stat
P-value
Lower 95%
Upper 95%
Intercept
21618.76125
784.6644173
27.5516
1.51E-15
19963.26
23274.26
Age
-1021.82125
186.8068149
-5.46994
4.15E-05
-1415.95
-627.693
Mileage
-0.029955521
0.02214948
-1.35243
0.193957
-0.07669
0.016776
SUMMARY OUTPUT
Regression Statistics
Multiple R
0.919994279
R Square
0.846389473
Adjusted R Square
0.828317646
Standard Error
1475.432767
Observations
20
ANOVA
df
SS
MS
F
Significance F
Regression
2
203909304.7
1.02E+08
46.83475
1.22E-07
Residual
17
37007331.46
2176902
Total
19
240916636.2
Coefficients
Standard Error
t Stat
P-value
Lower 95%
Upper 95%
Intercept
21618.76125
784.6644173
27.5516
1.51E-15
19963.26
23274.26
Age
-1021.82125
186.8068149
-5.46994
4.15E-05
-1415.95
-627.693
Mileage
-0.029955521
0.02214948
-1.35243
0.193957
-0.07669
0.016776
Explanation / Answer
1.
slope is negative for age
2.slope is negative for mileage
3.we will use adjusted R2
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