Critical thinking disposition inventory: Its validity and reliability

Abstract

In everyday life, we are always faced with problems. In trying to solve problems, we need higher-order thinking. One of higher-order thinking is critical thinking. Critical thinking includes critical thinking dispositions and skills. The critical thinking dispositions are an attitude or soul to develop critical thinking skills. This study aimed to describe the validity and reliability of the inventory of critical thinking dispositions. Testing of inventory used survey research. The testing was conducted at the public senior high schools in Buleleng Bali Indonesia. The population of the study was 4579 students from natural science classes. The samples were determined using the proportionate stratified random sampling technique. By the margin of error of 5%, the minimum number of samples needed was 355 people. By considering a return rate of 80%, the number of samples drawn was 444 people. The number of questionnaires returned by the students was 443. The data obtained were analyzed using the moment product correlation statistics and Cronbach’s Alpha to determine the validity and reliability of inventory, respectively. The results showed that the instrument’s validity is in the range of 0.095 to 0.756. Meanwhile, the reliability of the instrument is 0.727. There are two invalid items from 62 items. It can be concluded that this inventory of critical thinking dispositions can be used to measure the critical thinking dispositions of senior high school students.