Abstract:
This study deals with the effect of applying inquiry method on the students’
achievement in writing expository text. The objective of the study are to
investigate the effect of applying inquiry method on the students’ achievement in
writing expository text and to describe the students’ achievement after taught by
using this method. Descriptive quantitative method was applied in this research by
using experimental research design. This research was conducted at SMA
Pembangunan Nasional, Sukamandi Hilir, Deli Serdang on February 2017. The
population of this research was the grade students which consist of four
classes with 154 students. By using cluster random sampling, eighty students from
XI IPA 1 and XI IPA II was choosen as the sample. The inquiry method was
applied on the experimental group (XI IPA I), and lecturing method was applied
on the control group (XI IPA II). In obtaining the data, written test was giving to
the students. The finding showed that t-observed was higher than t-table
5.12>1.66, at α = 0.0, and df = 78. It means Ha is accepted and Ho is rejected,
applying inquiry method gives a significant effect on the students’ achievement in
writing expository text. The effect was 81% and 19% was influenced by others
factors. The students’ achievement after applying inquiry method was showing
positive improvement which was proven from the increasing of the students’ total
score around 1.147 and all the students were categorized able in writing
expository text.
