1. The following regression results relate to a study of the salaries of public school teachers in a midwestern city (the sample size was 450 teachers):

   Variable	Coefficient	Standard Error	t-ratio
   Constant	20,720	6,820	3.04
   EXP	805	258

   R-squared = 0.684; n = 105. Standard error of the estimate = 2,000. EXP is the experience of teachers in years of full-time teaching.

   1. What is the t-ratio for EXP? Does it indicate that experience is a statistically significant determinant of salary if a 95 percent confidence level is desired?

   2. What percentage of the variation in salary is explained by this model?

   3. Determine the point estimate of a salary for a teacher with 20 years of experience.

   4. What is the approximate 95 percent confidence interval for your point estimate from part (c)?

Please post steps using excel or Forecast x to solve so I can figure out what I am doing wrong