20 up to 25 or more of the population as the samples. According to McMilan 1992:73, cluster sampling involves the random selection of naturally occurring
groups or areas for examples universities, schools, classrooms, city blocks, and households. In this research, the researcher took about 25 or 70 students as the
respondents of the research. In this research, the researcher conducted a homogeneity test to all the
eighth grade classes. Then, the researcher analyzed the results of the test by using analysis of variance ANOVA to know the homogeneity of the population. Since
the value of variance was more than 0.05 or there was no statistically significant difference, the researcher chose two classes randomly of the whole eighth grade
classes because the population was homogenous.
3.4 Operational Definitions of the Key Terms
The operational definition is served as the guidelines to understand the terms used in this title. It is important to do to avoid misunderstanding between
the researcher and the readers about the terms. It focused on the use of cartoon video and reading comprehension achievement.
3.4.1 The Use of Cartoon Video
In this research, the use of cartoon video meant the use of English cartoon videos as media for the teacher to teach reading comprehension. The researcher
asked the students to watch the video viewed in front of the class. Here, the English cartoon video was used to visualize the narrative story and the text the
subtitle provided so that the visual clues in the video helped the students to understand the text the subtitle easily.
The cartoon videos used were chosen based on the curriculum of the English course. The cartoon videos used were
“The Greatest Treasure” in which the length was 00:05:46 and
“Zippy the Zebra” which had the length of 00:04:50. Those were in the forms of narrative text.
In giving the reading material for the experimental group, the researcher did the treatments in the language laboratory by using viewer and notebook. It
was possible because the viewer was provided in the language laboratory. For the control group, the researcher did the teaching learning process in the language
laboratory too but the researcher did not use the viewer and cartoon video in this teaching learning process. Instead, she just used printed text for the control group.
3.4.2 Reading Comprehension Achievement
Reading comprehension achievement in this research dealt with students’
scores obtained in the post test of reading comprehension that covered literal and inferential reading comprehension. The post-test was given after the researcher
gave the treatment. Dealing with literal reading comprehension, the students were required to find information directly stated in the text. Whereas, inferential
reading comprehension required the examinees to find the detail information from the text. The questions were given in the form of multiple choices and True-False
using narrative texts.
3.5 Data Collection Method
