Level of Difficulty H
referred to as reliability and if the results of a study can be reproduced under a similar methodology, then the research instrument is considered to be reliable.
Kirk and Miller 1986 identify three types of reliability referred to in quantitative research, which relate to: 1 the degree to which a measurement, given
repeatedly, remains the same 2 the stability of a measurement over time; and 3 the similarity of measurements within a given time period pp. 41-42. Charles
1995 adheres to the notions that consistency with which questionnaire [test] items are answered or individual’s scores remain relatively the same can be
determined through the test-retest method at two different times.
Reability of the pretest and posttest uses the degree to which a measurement, given repeatedly, remains the same. The motivation questionnaire uses rank order
correlation. The researcher ranked the result of students’ motivation, whether their results were considered as low, medium or high motivation. After that, they were
related to the result of pretest and posttest.