The following regression results relate to a study of the salaries of public-school teachers in a mid-western city (the sample size was 450 teachers): Variable Coefficient Standard Error Constant 20,720 6,820 EXP 805 258 R-squared = 0.684; Standard error of the estimate = 2,000. EXP is the experience of teachers in years of full-time teaching. 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?