Master’s thesis Environmental Management Assessment of the Source Separation of Household Solid Wastes in Nigeria



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Adedara, M.L
Adedara, M.L, Adedara, M.L, Summary of Doctoral Research Structure - FINAL SUBMITTED- ADEDARA, Adedara, M.L
3.2.2 Sampling technique
A total of 200 questionnaires were administered on the residents of the study area across the six
(6) LCDAs using the Systematic Sampling Technique at intervals of 10 housing units apart. In this sampling technique, only the first unit within the sample population is selected at random while the others are selected evenly according to a predetermined pattern unlike Simple Random
Sampling where each element within the population is randomly distributed (Ahmed, 2009). In cases where a street was too short to achieve 10 housing units apart, the house on the next street is taken as the next sample. The reason for the adoption of this technique is because it offers abetter random distribution that simple random sampling and allows fora more ordered selection from the sample population, which makes the variance smaller. A total of 50 respondents filled the questionnaires in the main Alimosho area 29 respondents at Agbado /Oke-Odo; 30 respondents at Mosan/Okunola; 29 respondents at Ayobo/Ipaja; 30 respondents at Egbe/Idimu and 32 respondents at Ikotun/Igando LCDA. In each LCDA the questionnaires were administered and collected on the spot because some respondents in this low-income area do not have sufficient proficiency in English hence the author had to translate some of the questions into the local Yoruba dialect (a language widely spoken by one of Nigeria’s three major tribes in southwestern Nigeria) and assisted in writing down the responses given by them to speedup the data collection process, which took up to 5 weeks. The questionnaire survey is a mix of both structured and multiple-choice questions numbering up to seventeen (17). The multiple-choice questions allowed the respondents a wide range of answers to choose from while the structured questions were intended to get their opinions on certain pertinent issues concerning the research. A similar research by Zhuang, et al
(2007) on the source separation of household waste using a case study in China adopted the same type of questionnaire survey to source data.
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24 During the fieldwork, the author observed that a particular multiple-question with four (4) options needed an additional option because the response from the respondents was not on the list of possible answers hence an additional option was created and added to the questionnaire in ink to reflect the current situation regarding the issue. Similarly, an adjustment was made to a particular response on the question under reference to capture the real issue on ground. The question under reference reads thus, How do you dispose your household waste. Option a reads, pickup by visionscape/Cleaner Lagos Initiative but in reality, the response was that they were informed by the agency to drop off their waste at a designated area within their neighbourhood for general communal collection at a later date for reasons that would be discussed under results. The additional option created for this question was, awaiting collection, the implication of which would also be discussed in subsequent pages. A questionnaire pretest on the sample population would probably have taken care of this before the field survey but due to distance and limited time constraints, no pretest was carried out rather the author relied on his experience from previous surveys in drafting the questionnaire.

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