Page 54 - Azerbaijan State University of Economics

THE JOURNAL OF ECONOMIC SCIENCES: THEORY AND PRACTICE, V.76, # 1, 2019, pp. 48-69

Calculations based on correlation were transformed into Fisher’s Z effect size. In
the evaluation of studies for which Fisher’s Z effect size was calculated, Cohen,
Manion and Morrison’s (2007:521) classification was used. This classification is as
follows:

Between ± 0.00 - ±0.10: Weak
Between ±0.10 - ± 0.30: Low
Between ±0.30 – ±0.50: Medium
Between ±0.50 - ±0.80: Strong
≥ ±80: Very strong.

Effect Size based on the Relationship between Leadership and School Climate
in Effective Schools
The effect size calculation based on the relationship between effective schools and
leadership was obtained from 11 studies. 9.09% of these studies (N=1) were written
as post-graduation dissertations, 36.36% (N=4) as doctorate dissertations and
54.55% (N=6) as articles. 36.36% of the studies (N=4) were written in Turkey,
while 63.64% (N=7) were written in other countries. 27.27% of the studies (N=3)
involved primary schools, 27.27% involved middle-schools (N=3) and 36.36%
(N=4) involved primary, middle and high-schools. In 9.09% of the studies (N=1),
although the inclusion criteria involved the suitable schools, the school type was not
indicated. The statistical information related to these studies is given in the table
below.

Table 1: Meta-Analysis Statistical Findings based on the Relationship between
School Effectiveness and Leadership
95 % Confidence
Interval for
Study N r Zr P
Fisher’s Z Effect
Size
BUZZI, 1990 621 0,64 0,758 0,679 0,837 0.000
Alt Limit Üst
HERBST,2003 884 0,34 0,354 0,288 Limit 0,420 0.000
OKAFOR, 2006 107 0,24 0,245 0,053 0,437 0.013
McVey, 2009 374 0,235 0,239 0,138 0,341 0.000
NGANG, 2010 181 0,554 0,624 0,477 0,771 0.000
BOLANLE, 2013 770 0,518 0,574 0,503 0,644 0.000
OZKAN, 2014 450 0,337 0,351 0,258 0,443 0.000
ABDURREZZAK, 2015 580 0,68 0,829 0,748 0,911 0.000
HARTHI VE AL- 635 0,80 1,099 1,021 1,177 0.000
MAHDY,2016
CERİT,2017 257 0,516 0,571 0,448 0,694 0.000
NGANG, 2011 546 0,70 0,867 0,783 0,951 0.000

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