Influence Of Polygamy On Behaviour Patterns Of In-school Adolescent As Expressed By Secondary School Teachers
[A CASE STUDY OF ILORIN METROPOLIS]

CHAPTER THREE
METHODOLOGY
Preamble
This chapter presents information on research methodology. The chapter covers research design, sample and sampling procedure, instrumentation, procedure for administration and data collection, procedure for scoring the instrument, and method of data analysis.
Research Design
The research design adopted for the study is a descriptive survey. The choice of descriptive survey was based on the fact that it provides information about the characteristics within a particular field of study with the purpose of providing a picture of situations, as they naturally exist (Burns & Grove, 1995). Olayiwola (2007) noted that descriptive research is concerned with the collection and analysis of data for the purpose of describing, evaluating or comparing current event or prevailing practices, event or occurrences. Descriptive survey method has the advantage of covering a wide scope, since a great deal of information can be obtained from large population. In a descriptive survey also, the characteristic of the defined population can also be inferred from the sample drawn from such population. It is for these reasons that the researcher considers the descriptive survey method appropriate for the study.
Sample and sampling technique
The population for the study comprises of all the secondary school teachers in Ilorin metropolis, while the target population consisted of ten (10) selected secondary schools in Ilorin Metropolis. The procedures used in selecting sample for this study were purposive sampling and stratified random sampling techniques.
The purposive sampling method was used to select ten (10) secondary schools in Ilorin Metropolis. The schools that were covered include: Government High school, Adeta, GDSS Adeta, GGDSS, Pakata, GDSS Adewole, Barakat community Secondary School, Mount Camel Secondary School, GDSS Tanke, GDSS Fate, Queen Elizabeth School and Sheik Abdulkadir College,  Ilorin. Purposive sampling techniques was considered appropriate for the study because it is a form of non-probability sampling technique which is characterized by the use of judgement and deliberate effort to obtain representative samples by including presumable typical areas of groups in the sample (Hassan, 1998).
However, stratified random sampling technique was used to select one hundred (100) teachers from the selected secondary schools within Ilorin metropolis. Ibrahim, Landu and Opadokun (2004) described stratification as a process in educational research whereby variables are classified into groups according to desired characteristics of the variables such as sex, age group etc. Thus, the stratified random sampling technique would be adopted to select the respondents according to the variables of the study. The variables are gender, age, and religion as well as educational qualification.
Instrumentation
The main instrument that was used to collect data for this study is questionnaire. Questionnaire is one of the common and effective research instrument used to elicit information in education. For the purpose of this study a questionnaire was designed personally by the researcher after a careful review of the related literature and it is tagged “Influence of Polygamy on the Behaviour Patterns of Adolescent Questionnaire” (IPBPAQ). The questionnaire comprises two (2) sections; A and B. Section A focuses on the demographic data of the respondents which include information on age, gender, religion, and educational qualification. Section B contains fifteen (15) items which seeks to establish the influence of polygamy on adolescent behaviour patterns. It was patterned after the Four Point Likert Type rating scale format of:
SA Strongly Agree (4 points)
A Agree (3points)
D Disagree (2points)
SD Strongly Disagree (point)
Psychometric Properties of the Instrument