其他摘要：This classroom action research was to develop statistical thinking of grade 7 students using the Five Practices in designing and organizing learning activities. The target group consisted of 45 Grade 7 Students at Chiang Mai University Demonstration School. The research instruments included 9 lesson plans, post instruction reflecting notes, statistical thinking test and VDO. The research was conducted along the 4 steps of continuous 3 cycles of classroom action research composed of Plan, Act, Observe and Reflect (PAOR). The researcher applied the Five Practices which was developed by Smith and Stein (2011) to design learning activities that scaffold the students to acquire mathematical understanding by himself through the challenging mathematical tasks and also Anticipating student ideas to challenging mathematical tasks. Then Monitoring, Selecting, Sequencing and Connecting different student responses to the key objective of lesson. The data were analyzed in terms of percentage and analytical description. The findings reveal that twenty-four students had statistical thinking at level 3, 53.33%. The seventeen students at level 4, 37.78%. Followed by level 2 of three students and level 1 of one student, which is 6.67% and 2.22% respectively.
