Answer:
B.subtract 1 from the estimated​ coefficient, divide the difference by the standard​ error, and check if the resulting ratio is larger than 1.96.
Step-by-step explanation:
Given that you wanted to​ test, using a​ 5% significance​ level, whether or not a specific slope coefficient is equal to​ one, then you​ should:
For 95% confi level Z critical =1.96
So we multiply the std error by 1.96 to get margin of error
Using confidence intervals we divided the slope difference by std error and check whether this absolute value is greater than 1.96
Hence option B is right
B.subtract 1 from the estimated​ coefficient, divide the difference by the standard​ error, and check if the resulting ratio is larger than 1.96.