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CHAPTER III METHODS OF INVESTIGATION
This  chapter  discusses  the  methods  of  investigation  which  consists  of  subject  of the  study,  roles  of  the  researcher,  research  design,  research  procedure,  research
variables,  types  of  data,  instruments  for  obtaining  data,  procedures  of  obtaining data, and procedures of analyzing data.
2.3 Subject of the Study
The subject  providing the data of this study  was  the eleventh  graders of  PGRI 2 Private Vocational School Salatiga. This school is located at Jl. Nakula Sadewa I,
Kembang Arum, RT 02, RW 03, Kel. Mangunsari, Kec. Sidomukti, Salatiga. The researcher used class XI D-AP which consisted of 34 students as the sample who
still possessed low mastery of grammar based on the data obtained in preliminary observations  during  the  teaching  practicum  PPL.  Moreover,  eleventh  graders
were chosen because the simple past tense was taught at this education level.
2.4 Roles of the Researcher
The researcher played important roles in this research as a teacher who patiently taught  the materials  to  the students  and checked their mastery of the simple past
tense  through  tests;  a  data  collector  who  collected  the  data  obtained  from observation,  tests,  and  questionnaire;  and  a  data  analyzer  who  then  analyzed  the
collected data in order to be able to draw any conclusions based on the end results.
2.5 Research Design
Research  design  refers  to  the  plan  that  will  be  used  to  conduct  the  study. According to Pollard and Triggs 1997:65
“action research involves researchers, with  teachers  or  other  practitioners,  in  a  cyclical  process  of  planning,  action,
observation,  and  reflection  before  beginning  the  whole  process  all  over  again ”.
These processes or phases could be elaborated as follows: 1
Planning At this phase, the researcher planned a detailed set of decisions about how to take
the action in the future and how to improve an action. What is the actual problem arises  in  the  class?  Who  will  do  the  action?  When  will  it  happen?  What  are  the
proposed  changes  to  the  learning  process?  How  do  I  intend  to  apply  my  revised teaching methods? This is because it is so much important to find out if the plans
are able to be done and to consider how students‟ reactions to the implementation are.
2 Acting
At  this  phase,  the  researcher  implemented  the  arranged  plan  in  the  class.  After answering  questions  at  planning  phase,  I  tried  to  give  the  treatments  to  the
students in the hope of improving their learning achievements. The researcher also had  to  make  sure  that  any  deviations  from  the  plans  had  been  recorded  since
reality sometimes could be unpredictable. 3
Observing Observing  phase  ran  along  with  acting  phase.  There  was  a  detailed  observation,
monitoring, and recording during the treatments were given in the classroom. This
was  used  by  the  researcher  to  assess  how  much  the  improvement  of  the  action was.
4 Reflecting
At this phase, the researcher reflected the overall learning process considering the results of the observations. By reflecting, I could make a strong decision whether
a replan was truly needed or not.
2.6 Research Procedure