7.7 Individual Hypothesis Testing H: B=0 or b, =0 Hypothesis testing: t test df =n-k kthe number of parameters estimated (including the intercept) 7.7.1 The Test of Significance Approach 7.7.2 The Confidence Interval Approach7.7 Individual Hypothesis Testing: H0 :B2 =0, or B3 =0 Hypothesis testing: t test d.f.=n-k k～the number of parameters estimated（including the intercept） • 7.7.1The Test of Significance Approach • 7.7.2The Confidence Interval Approach