Impact of Cooperative Learning Approaches on Students’ Academic Achievement and Laboratory Proficiency in Biology Subject in Selected Rural Schools, Ethiopia

+emain objective of this study was to evaluate the impact of cooperative learning methods on students’ academic achievement and laboratory proficiency in biology subject. Quasi-experimental control group interrupted time series design was employed. Data pertaining to these variables were collected from 369 students and 18 biology teachers in three schools. A series of biological tests and semistructured questionnaire were used to collect data. Multivariate analysis (two-way ANOVA) was used to analyze the test scores exposed by teaching methods, and semistructured questionnaire was administered to comprehend factors that hamper the successive execution of CL. Hence, multivariate analysis revealed that there was no significant (P> 0.05) difference in the pretest score of the learner academic performance; however, there were significant differences (P< 0.01) in the posttest results by teaching methods, but not by schools. Correspondingly, there were significant differences in the pretest (P< 0.05) and posttest (P< 0.01) results of the students’ laboratory proficiency by teaching methods. +e results exemplify that there was significant learning gain obtained via CLAD followed by cooperative discussion group (CDG). +e result from the questionnaire survey showed that the number of students, lack of laboratory equipment, and so on hamper consecutive execution of CL.


Introduction
Education plays a pivotal role in maximizing individual's potentials and is a prerequisite for meaningful and sustained national economy [1]. Even though the educationists had made efforts in improving teaching-learning processes, instructional designers are still searching and experimenting to get best methods for optimal academic performance of the students [2]. is is because, in the traditional approach of teaching, most of the class time is spent by teachers talking and students watching and listening, and cooperative learning appears to be discouraged [3]. Similarly, Johnson et al. [4] elucidated that, in individual learning, how the students perceive and interact with one another is a neglected aspect of instruction. Correspondingly, the knowledge of biology contributes to scientific literacy and helps to understand the world in which we live [5,6]. However, the students' learning performance and achievement in biology have been poor over recent years [7]. e poor performance and laboratory proficiency in biology are influenced by not having expository approaches that stand up to challenge the objectives of biology education [5,[8][9][10]. us, schools should be encouraged to adopt pedagogical practices that promote the active involvement of students' learning [11]. One practice that has received widespread coverage over the past decades is cooperative, small-group learning [12].
is is a pedagogical practice that helps students to gain and create both academic and social relationships as well as to accomplish shared goals [13].
rough such kind of interaction, students learn to crossexamine issues, share ideas, elucidate differences, and construct new understandings [14]. Even though cooperative learning (CL) has revealed a number of integral functions, it has not been a far and broaden approach of teaching methodology in the study areas (Gassaye, Fert, and Kimer Dengay secondary schools). Correspondingly, research findings showed that very few teachers who implemented CL method could not even consider some aspects of the learners being organized on the basis of academic achievement, interest, and gender; these may in turn degrade and worsen the students' perception towards CL activities. Correspondingly, researches like [3,[15][16][17][18] were conducted on CL in mathematics, English, education, and sociology, and few studies were conducted on the effectiveness of CL in science education in some other African countries like Kenya and Nigeria [6,7,19]; however, there are no further studies which revealed the impact of CL in biology in Ethiopia, in particular in the study area. erefore, the aim of this study was to assess the variation in the students' academic achievement and laboratory competency treated by the individual learning and heterogeneous and homogeneous CL approaches in grade nine students in biology subject in the selected rural schools in Farta District, South Gondar Zone, Northwest Ethiopia.

Research Questions.
To achieve the central aim of the study, the following research questions were entertained in this study: (1) To what extent cooperative learning (CL) strategies are effective to enhance students' academic achievement and laboratory proficiency in biology subject? (2) What is the perception of teachers and students towards the impact of cooperative learning (CL) methods on students' academic achievement and laboratory proficiency?

Hypothesis
H 1 : there is no significant difference in the average test scores of academic achievement of the students exposed to different teaching methods by study areas. H 2 : there is no variation in the mean test scores of the students' laboratory proficiency as influenced by different teaching methods and study areas.

Research Design and Experimental and Control Groups of the Study.
is study examined the impact of cooperative learning approaches on students' academic achievement and laboratory proficiency in grade nine students in selected rural schools. e research design employed to conduct this study was quasi-experimental control group interrupted time series design involving preobservation (pretest) and postobservation (posttests). In this design, two treatments were compared with two experimental groups. Accordingly, the students were randomly assigned to each of the teaching methods, namely, individual learning (IL) taken as the control group and the experimental groups (cooperative discussion group or CDG (one top achiever student leads the other five different academic performance levels of students) and cooperative learning achievement division (CLAD) based on the previous academic competency procured from the schools' registrar). As stated in [20][21][22], the cooperative learning regarding achievement division (CLAD) was the most successful teaching method in which students are organized based on their academic performance into top achievers, middle achievers, and lower achievers discretely. ey further described that, through CLAD, students must be held individually accountable, and to achieve group objectives, the students pay their roles autonomously. Afterwards, a series of biological activities and tests were offered in the same way to those students engaged in each teaching method to evaluate their academic achievement and laboratory skill performance in biology. Moreover, to comprehend the teachers' and students' acuity on the impact of CL approaches, a semistructured questionnaire was administered in the selected rural schools in Farta District, Northwest Ethiopia.

Sampling Technique and Population Size.
e studied groups of this study were grade nine students, and the sample size was determined using the following formula recommended by Kothari [23]: where Z � 1.96 (95%) confidence level, P (estimated characteristic of the population) � 0.5, q � 1 − P, e � 0.05 of the accepted error, and N � 9940. Subsequently, 369 students (123 students) for each of the three areas, namely, the Gassaye, Fert, and Kimer Dengay secondary schools, were selected to evaluate the academic achievement and laboratory competency as exposed to different teaching methods in the purposively selected rural schools in Farta District, South Gondar Zone, Northwest Ethiopia. Furthermore, eighteen biology teachers were purposively selected for the questionnaire survey of the study so as to assess their overall perception on the execution of the cooperative learning methods.

Data Analysis
Techniques. e collected data were analyzed using generalized linear model of multivariate analysis (two-way ANOVA) using SPSS version 20. Furthermore, quantitative data obtained through semistructured questionnaire were analyzed using descriptive statistics to apprehend the perception of teachers and students on the successive execution of CL.

ANOVA on the Pretest Score of the Students Exposed to Different Teaching Methods by Areas.
e two-way analysis of variance showed that there was no significant difference (P > 0.05) in the pretest scores of the students' academic achievement by teaching methods (IL, CDG, and CLAD) and study areas (Table 1). e numerical value obtained from most students' pretest result within the selected rural schools revealed that the students' biology result was below the average national grade point, in which relatively a bit higher test score was found in the students of Gassaye secondary school (41.8 ± 9.4), followed by Fert secondary school (41.6 ± 10.4) and Kimer Dengay secondary school (39.9 ± 11) ( Table 2). is implied that the academic status of the learner was greatly comparable before exposing them to different teaching methods; this could be due to the teachers' knack to decide materials needed to conduct the lesson, academic and social-skill objectives, and the method of assigning students to groups. Accroding to Otuka and Uzoechi [9], the low academic achievement of the students' in biology could be attributed to the teachers devote much time on the individual learning method rather than in the innovative way of teaching. is result is also in line with the research findings reported by Gokkurt et al. [16], which showed no significant difference between the achievements of the groups (CL and IL) according to the results of the independent t-test (t(48 � 0.524; P > 0.05)) on the knowledge of GDC-IPPC in grade nine mathematics class. On the other hand, Muraya and Kimamo [7] found a statistically significant difference (P < 0.05) in achievement scores of students who had no prior knowledge (pretest) of the biology lesson.

Posttest Achievement Results of Students Exposed to Different Teaching Methods by Areas.
e result of the two-way ANOVA revealed that there were significant (P < 0.01) differences in the posttest scores of the learner academic achievement through the influence of different teaching methods (Table 1). However, the learners' posttest achievement scores did not show significant difference (P > 0.05) by study schools. e students' exam result showed that there were trends in improving the academic performance evaluated through successive tests in contrast with the pretest result. is could be due to the methods of teaching delivered to the students transformed from the conventional lecturing method to the communicative way of teaching approach (CL). e highest mean value of the students' academic achievement posttest one (67.0 ± 16.3) in CLAD, posttest two (71.2 ± 12.1) in CDG, and post-test three (73.1 ± 16.2) in CLAD teaching methods was recorded in Gassaye and Fert secondary  schools compared to IL in which the lowest mean value was recorded in posttest one (52.2 ± 15.9), posttest two (54.4 ± 9.8), and posttest three (55.5 ± 9.1) ( Table 2). For this reason, the experimental groups (CDG and CLAD) showed greater improvement in academic achievement. erefore, the null hypothesis of no significant variation in the average test score of the academic achievement of students' exposed to different teaching methods is rejected. A similar result was reported by Ahmad and Mahmood [24], who explained that there was significantly higher learning gains and positive learning experience in CL (X � 20.17) as compared to IT (X � 17.73). A few studies [11,17,25] used student achievement division as an experimental treatment in a study involving lowperformance students. ey found that the cooperative learning achievement division group scored significantly higher on academic performance than the EFL learners. Swab [26] found that cooperative learning resulted in significantly higher achievement in a college-level computeraided drafting course.

e Effect of CL on the Students' Laboratory Proficiency in
Biology Subject

Pretest Scores of the Laboratory Competency by Areas and Teaching
Methods. e present study revealed that there was a significant difference (P < 0.05) in the pretest score of the students' laboratory competency by study sites and teaching methods ( Table 3). Regardless of the significant difference, numerically the highest mean value of practical skill performance was obtained in Kimer Dengay secondary school (42.8 ± 10.8) and the lowest mean value (35.8 ± 9.6) was registered at Fert secondary school (Table 4). is variation in the students' practical skill performance could be attributed to the lack of laboratory equipment and technicians, teachers' commitment, and students' initiation to be engaged in laboratory work.
is result well aligned with the study [7] that  3.6 * * 6.67 * 6.9 * 7.6 * * Significant at P < 0.01; * * significant at P < 0.01; LSD, least significant difference; SD, standard deviation; FG, Fert General Secondary School; GG, Gassaye General Secondary School; KD, Kimer Dengay General Secondary School.   Education Research International reported a statistically significant difference (P < 0.05) in biological skills of students who had no prior knowledge (pretest) of the subject. However, research results of the studies [6,27] contradicted the findings of the present study that explained the absence of significance variation in the students' pretest score on practical competency. Feyzioglu [28] further elucidated that teachers should have a positive attitude towards laboratory use and environment to create impression in students' minds.

Posttest Results on Practical Skill Competency of the Students Exposed to Teaching Methods by Areas.
e multivariate analysis indicated that there was a significant difference (P < 0.05) in the posttest three result of the students' practical skill competency by areas. However, no significant differences were found in the posttest one and two results of the students' practical skill competency (Table 3). Nonetheless, numerically there was a trend in increasing the students' score results within the successive tests.
us, the higher average values were recorded in CDG (65.9 ± 14.3) of posttest one and CLAD of posttest two (66.1 ± 12.2) and posttest three (66.5 ± 13.9), respectively, as compared to the IL method ( Table 4). As a result, the null hypothesis that explains that there is no significant difference in posttest scores of the laboratory competency exposed by different teaching methods is rejected. is finding is consistent with the result of Orora et al. [10], who reported that there was no significant difference (t � 2.87, P > 0.05) in the pre-and posttest results of the students' academic achievement using CEL strategy and IL in biology lessons. However, a higher mean score result was obtained via CEL compared to the IL. Significantly higher result was also achieved in successful students by using high level of laboratory skills in chemistry course [28]. Hofstein and Mamlok-Naaman [29] further reviewed and reported that performed laboratory activities based on interest and achievement levels enhance students' science process and problem-solving skills.

e Relationship between the Students' Academic Achievement and Laboratory Proficiency in Biology
Subject.
e result obtained from the correlation analysis revealed that there was substantial relationship between the laboratory proficiency and academic performance in biology influenced by different teaching methods and study sites. is is indicated by the students' test score results that showed a positive increment after the delivery of the pretests (39.466; 38.87) for both the academic and laboratory performances, respectively (Figure 1). Even though the two learning performances were significantly correlated, the highest average values were registered on the students' academic achievement in the entire results of the posttest one (61.434), posttest two (65.0), and posttest three (66.07) as compared to their laboratory competency (57.93, 60.77, and 61.92) in posttests, respectively (Figure 1). e lower mean values in laboratory competency could be attributed to the lack of proper laboratory equipment and chemicals and the students' acquaintances with the laboratory tests.
is is in line with the research findings [30,31], which stated laboratory classes with well-administered experiments and appropriate methods improve the students' skills like scientific thinking, observation, creating thinking, and problem-solving ability.

Teachers' and Students' Propensity for the Effective Implementation of CL.
e results of the questionnaire survey revealed that 12 (66.67%) teachers and 219 (59.3%) students of the sample give better credence to collaborative work than working independently (Table 5). is implies that these respondents understood the significance of CL as a widely accepted approach of teaching that encourages interactive learning.
is concedes with the research findings of the study [15] that showed that teachers' positive belief on CL activities could be attributed to the  (Table 4). Brown et al. [32] point out that the traditional method may attribute to the achievement gap, while CL focuses on interdependence that promotes intellectual growth and competency of learners. Furthermore, 5 (27.78%) and 89 (24.1%) of the sampled individuals favor CL and thus executed it regularly in their classrooms ( Table 5). As noted by Gilliam [33], CL is a viable and effective instructional method because it guarantees the building of higher level thinking skills and academic achievement. From the total respondents 4 teachers (22.22%) and 43 students (11.6%) percieved that, CL is better when students are organized based on their interest and academic achievents (Table 5). Similar findings were reported by Fiszer [30], who explained the significant learning gain when students are organized by their level of interest and learning performance.

Factors at Impede the Effective Execution of CL.
A number of factors affect the successive implementation of CL activities during the teaching-learning process. us, 5 (27.8%) of the sampled teachers and 94 (25.5%) students discretely perceived that the number of students or classroom size is the major factor that setbacks CL activities in the selected schools. On the other hand, 4 (22.2%) of the teachers and 85 (23.1) students considered the shortage of biological materials and chemicals as a major factor for CL ( Figure 2). Surprisingly, 1 (5.6%) of the respondent teachers and 10 (2.7%) students found that some factors like lack of providing enthusiastic approaches significantly influenced the successive execution of CL in the study areas ( Figure 2). is perception of the sample respondents is in agreement with the findings of Anto et al. [15], who revealed that classroom size, lack of proper training on CL, lack of pedagogical knowledge and skill, and lack of supportive materials are the substantial factors that are encountered on CL implementation.

Conclusions
Based on the research findings, the following conclusions are met: (1) considerable increments in the biology achievement and laboratory competence were seen in students exposed to CLAD through successive score tests, followed by CDG, and lower performance was registered by IL; (2) significant relationship in the students' academic achievement and laboratory proficiency was observed through continual tests; and (3) the sample respondents perceived that CL methods, especially the CLAD, provided higher learning gains in biology. However, some factors affect the successive implementation of the methods. erefore, to foster the students' entire competency, teachers can implement innovative ways of teaching like CLAD and CDG in their actual classroom, encourage to develop positive belief, and create conducive environment for CL.

Questionnaire on the Overall Perception of the Teachers and the Students towards CL Approaches
Dear respondents, this questionnaire is one of the research tools developed to gather information on the "Impact of Cooperative Learning Approaches on Students' Academic Achievement and Laboratory Proficiency in Biology Subject in Selected Rural Schools, Ethiopia." e information apprehended was used to conceive the perception of teachers and students towards the teaching approaches and the factors that hamper cooperative learning approaches and to provide possible suggestion based on the findings of the research. e questionnaire is divided into three parts in order to collect information related to cooperative learning approaches.
us, you are kindly requested to furnish your honest and valuable responses to fill in this questionnaire. Your candid response is highly relevant for the study, and it will be used only for academic purposes.
Please note that the research notion is used to evaluate the effectiveness of teaching methods, which are the cooperative learning discussion group (one top achiever student leads the other five different academic performance levels of students), cooperative learning achievement division or CLAD (one top achiever student directs the other five with the same level of performance (top achievers) and middle achievers and lower achievers are also arranged separately based on the previous results collected from the schools registrar), and the individual learning (lecturing) methods.  Dividing the lesson into small and easily digestible pieces for the discussion (explain prerequisite facts and reteaching if necessary) 14 Maintaining proper time for discussion and allowing them to reflect their ideas at the time of discussion 15 Providing review or stabilizing the lesson following students' discussion 16 Evaluating students' attitude and understanding frequently following the cooperative learning activities (by giving questions and group and individual works) School environment 17 Arranging proper placement for the students during CL

18
Creating conducive environment for cooperative learning 19 Monitoring the behaviour of the students when in discussion and advising those disrupting the class 20 Attending (controlling) the students regularly using various monitoring mechanisms during cooperative work 21 Conducting case study or action research about the effectiveness, factors, possible solution, and on school environment for cooperative learning activities