2.5 A researcher is interested in the impact of a head start on students' test performance. Case 1: When all kids whose parents have annual income of less than 60 thousand dollars are eligible for pre- school enrollment and all of them actually enrolled the pre-school, this is considered as_() Case 2: When all kids whose parents have annual income of less than 60 thousand dollars are eligible for pre- school enrollment but only some of the eligible kids enrolled the pre-school, this is considered as _(ii) (a) Sharp RDD (b) Fuzzy RDD Fuzzy RDD Sharp RDD 2.6 A researcher is interested in the impact of scholarship program on GPA. Scholarship is given to all students whose SAT score is greater than or equal to 1,500. The researcher employed the regression discontinuity design to investigate the impact of scholarship and estimated the following regression: GPA-A+ ASAT + Al(SAT 21500}+ u Answer where these parameters are shown in the graph below A B C GPA (c) . SAT 1,500 2.7 Regarding the previous question, students with SAT scores less than 1,500 are considered as-(i), while those with SAT scores greater than or equal to 1,500 are considered as _(ii). (a) (b) the control group the treatment group the treatment group the control group 2.8 Regarding the scholarship question, students with SAT scores around 1500 are considered as very()in terms of scholastic ability. Therefore, the _(ii) around 15,00 is considered as the impact of scholarship (a) different discontinuity (b) diffeent kink (c) similar discontinuity (d similar kink