Suppose that a​ researcher, using data on class size ​(CS​) and average test scores from 100 ​third-grade classes, estimates the OLS regressionTestScore =​556.8280+(−6.2274)×CS,R2=0.11,SER=12.3(21.8280)(2.3205)​ Construct a 95% confidence interval for β1​, the regression slope coefficient. The 95% confidence interval for β1​, the regression slope coefficient, is । (Round your responses to two decimal places.) The t-statistic for the two-sided test of the null hypothesis H0​:β1​=0 is (Round your response to four decimal places.) Note: Assume a normal distribution. The p-value for the two-sided test of the null hypothesis H0​:β1​=0 is . (Round your response to four decimal places.)