Development of Achievement Test about Unit of "Nature and Chemistry" for 9th Grades: A Validity and Reliability Study

Abstract

This study aims to develop a valid and reliable achievement test concerning Unit of “Nature andChemistry” for the 9th grade. For this purpose, the 2018 Secondary School Chemistry Curriculum and textbookswere examined, and 53 questions were prepared by taking into consideration these acquisitions. After thequestions were reviewed by two faculty members, the test was examined by two chemistry teachers to providecontent validity. Based on the expert opinions, the number of questions was reduced to 29. The pilot study wascarried out with 181 (89 female, 92 male) 10th-grade students attending three different high schools. At the endof this application, Cronbach's Alpha was calculated as 0.889, and it was decided to remove the four questionsfrom the test. “Nature and Chemistry Unit Achievement Test” developed was applied to 421 students. CronbachAlpha was re-calculated as 0.886. As a result of the factor analysis, it was determined that the test consisted of 4factors and Cronbach Alpha values of each factor were between 0.61 and 0.76, respectively.