D. Technique of Data Collection
To get the data for the variable Y, the writer cooperated with an institution that is Psychology Service Centre of UIN Jakarta
— usually called Pusat Layanan Psikologi PLP to hold an IQ test program.
The Culture Fair Intelligence Test CFIT is used to measure the IQ score which would utilize only elements common to all cultures. The Culture Fair tests
consist of three scales with non-verbal visual puzzles. Scale I includes eight subtests of mazes, copying symbols, identifying similar drawings and other non-
verbal tasks. Both Scales II and III consists of four subtests that include completing a sequence of drawings, a classification subtest where respondents
pick a drawing that is different from other drawings, a matrix subtests that involves completing a matrix of patterns and conditions subtests which involve
which out of several geometric designs fulfill a specific given condition.
2
The CFIT test is a test which measure cognitive ability and devoid of sociocultural and environmental influences. Since the cognitive ability may affect
a learning process, it considers to conduct such a kind of test. Besides, the CFIT test is usually used to measure IQ of people who will enroll the higher education
level. Besides, t he students’ achievement of Extensive Reading course variable is
taken from documentation score that the reading lecturer has.
E. Technique of Data Analysis
After getting those data, the writer has to analyze the data and correlate between the students’ IQ score and the score of Extensive Reading course. The
writer did description analysis to describe the data statistically. Then, the study used formula of Pearson Product Moment Correlation:
3
2
George Domino and Marla L. Domino, Psychological Testing: An Introduction, New York: Cambridge University Press, 2006, p.282.
3
Riduwan and Akdon, Rumus dan Data dalam Analisis Statistika, Bandung: Alfabeta, 2013, .124.
in which:
r
xy
:the correlation coefficient between Extensive Reading achievement scores and Intelligence Quotient IQ scores
N : the number of respondent
X :
the student’s score in Intelligence Quotient IQ Y
: the student’s score in reading achievement
ΣX : the sum of Intelligence Quotient IQ scores ΣY : the sum of Extensive Reading achievement scores
ΣX
2
: the sum of squares of Intelligence Quotient IQ scores ΣY
2
: the sum of squares of Extensive Reading achievement scores ΣX
2
: the squares of the sum of Intelligence Quotient IQ scores ΣY
2
: the squares of the sum of Extensive Reading achievement scores ΣXY : the sum multiple of Intelligence Quotient IQ scores and Extensive
Reading achievement scores Then, the contribution of the independent variable x towards the
dependent variable y is investigated through the determination coefficient r
2
as follows:
4
R : value of determinant coefficient r
2
:value of the squared correlation coefficient Moreover, after getting the r score, the significance between two variables
will be tested to know the correlation between variable X and variable Y. The formula of the significance test is:
5
4
Ibid, 2013, p. 125.
5
Sugiyono, Metode Penelitian Kuantitatif, Kualitatif dan R D, Bandung: Alfabeta, 2013, p. 187.
R = r
2
x 100
t
count
=
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