A Development of Mathematical Problem Solving Skills via Phenomenon Based Learning Approach in Statistics for 7th Grade students

The objectives of the research are 1) to develop the phenomenon-based lesson plan for teaching
statistics; 2) to study effectiveness of the phenomenon-based lesson plan for teaching statistics; and
3) to evaluate mathematical problem-solving skills in the area of statistics among 20 students in the 7th
grade at Ongkharak Demonstration School, identified from the cluster random sampling technique
based on the classroom as the sampling unit. The research instrument includes three phenomenonbased lesson plans on the topic of statistics approved by the reviewers with the scores of 4.76, meaning
that it is appropriate to use at the highest rate. In addition, the assessment for evaluating the
mathematical problem-solving skills in the area of statistics concludes 5 written question with the difficult
index (p) of 0.40 - 0.60 and the discrimination index (r) of 0.59 - 0.79. The results found that 1) the
phenomenon- based lesson plan for teaching statistics was effective in terms of process and result
which was equivalent to 80 . 4 7/ 8 8 . 3 0 , higher than the criteria of 70/70 ; 2) the effectiveness index of
learning using the phenomenon-based lesson plan on the topic of statistics was 0.8399 , demonstrating
that students in the statistics lessons using phenomenon-based approach had learning progress of 83.99
percent; and 3) students in the statistics lessons using phenomenon-based approach had mathematical
problem-solving skills equivalent to 88.30 percent, higher than the criteria of 70 percent.