Find the required confidence interval for the slope of the regression equation. You may assume the conditions for regression inference are satisfied. Applicants for a particular job, which involves extensive travel in Spanish-speaking countries, must take a proficiency test in Spanish. The sample data were obtained in a study of the relationship between the numbers of years applicants have studied Spanish and their score on the test. Use the regression analysis given below to find a 99% confidence interval for the slope of the regression line. Dependent Variable is : Score
R sqaured = 83.0%
s= 5.65138 with 10-2 = 8 degrees of freedom

Variable Cofficient s. e. of Cofficient t-ratio prob
Constant 31.5333 6.360418 4.957745 0.00111
Number of years 10.90476 1.744054 6.252538 0.000245