You estimate a simple linear regression model using a sample of 25 observations and obtain the following results (estimated standard errors in parentheses below coefficient estimates): y=97.25+19.74x If the standard errors for the estimated intercept and slope are 3.86 and 3.42 , respectively, what is the 98% confidence interval for the true population slope () : a. (5.77,25.51) b. (16.32,23.16) C. (11.22,28.26) d. (12.90,26.58)