Length of Light (X) Number of Cars (Y)
10 20
13 19
19 17
25 11
28 9
30 8
SUMMARY OUTPUT
Regression Statistics
Multiple R 0.983787369
R Square 0.967837588
Adjusted R Square 0.959796985
Standard Error 1.060982761
Observations 6
ANOVA
df SS MS F Significance F
Regression 1 135.4972623 135.4973 120.3688 0.000392143
Residual 4 4.50273768 1.125684
Total 5 140
Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper 95.0%
Intercept 27.25286212 1.283270327 21.23704 2.91E-05 23.6899325 30.81579 23.68993 30.81579
Length of Light (X) -0.636137382 0.057982106 -10.9713 0.000392 -0.797121516 -0.47515 -0.79712 -0.47515
Calculate the regression line.
If the length of a light is seven seconds, how many cars would you predict would run the red light?