Obtain the outlier- excluded regression model for the data of Exercise 11.83. a. Interpret the intercept (constant)

Question:

Obtain the outlier- excluded regression model for the data of Exercise 11.83.
a. Interpret the intercept (constant) term. How much meaning does this number have in this context?
b. What would it mean in this context if the slope was 0? Can the null hypothesis of zero slope be emphatically rejected?
c. Calculate a 95% confidence interval for the true population value of the slope.