A regression line is used to satisfactorily describe the relationship between amount of car surface per square inch and drying time (in minutes) of 24 cars in a car wax drying time study. The regression analysis is shown. Variable
Coeff SE Coeff t Ratio p-Value
Constant 4.5893 0.2784 16.49 0.0023
Amount of car surface
5.8493
0.3827 15.30 0.0045
R squared = 89.1%
R squared (adj) = 90.1%
Which expression should be used to compute a 96 percent confidence interval for the slope of the regression line?

a
5.8493 ± 2.172(0.3827)

b
5.8493 ± 2.183(0.3827)

c
5.8493 ± 2.177(0.3827)

d
4.5893 ± 2.183(0.2784)

e
4.5893 ± 2.177(0.2784)