Prevalence Of And Motivation For Drug Abuse  

Pilot Testing  
The pilot testing is used to determine the usability of an instrument. To establish this, the instrument was administered to ten students of the University of Ilorin, which did not form part of the final respondents of the instrument. After administration, the researcher interacted with the respondents, recorded their observation about the instruments and effect necessary corrections.
Psychometric Properties of the Instrument
An instrument is considered appropriate when it possesses certain properties or qualities such as validity and reliability.
Validity: Validity is the ability of a research instrument to measure accurately what it purports to measure. A measuring instrument is valid when it measures truly and accurately the quality or ability it is designed to measure (Ajayi & Razak, 2000). According to Margaret (2003), validity is the ability of an instrument to measure that which the investigator will like to measure. Validity is best tested by comparing the findings with a suitable standard gold. Also, Robert and David (2004) referred to a valid instrument as the accuracy with which the scores measures a particular cognitive ability of interest. Hence, after the construction of the questionnaire by the researcher, five (5) experts (lecturers) including the researcher’s supervisor in the department vet for its content validity. According to Best (1981) content validity estimate can be obtained from the panel of experts who would rate an instrument in terms of how effectively they represent salient aspects of the purpose of the study. Modification of the instrument was therefore made as suggested.
Reliability: Reliability is concerned with how consistence an instrument could measure what it purports to measure. Margret (2003) noted that reliability also termed reproducibility or repeatability, is the stability or the consistency of information i.e the extent to which similar information is supplied or obtained when a measurement is performed more than once. If a reliable instrument is given two or three times to the same sample, each person in the group should approximately get the same score on different occasions (Kulbir, 2007). The test-re-test method of reliability was adopted to determine the consistency of the instrument in the interval of four weeks. Copies of the instrument were administered to twenty (20) University of Ilorin students. Four weeks later, the same group of students was re-tested, scores from the two tests were correlated using the Pearson Product Moment Correlation Co-efficient (r) at 0.05 alpha level. The co-efficient (r) for the administrations was found to be 0.74 respectively. This was considered high enough to make the instrument reliable.
Procedure for Data Administration and Collection
The questionnaire was administered with the help of two research assistants to randomly selected samples of four hundred and fifty (450) University and College of Education students. This was supervised personally to ensure no missing or reduction in questionnaire and to facilitate quick and accurate responses.
Procedure for Scoring
Scoring implies the scaling and rating adopted for the instrument. In section “A” frequency count and simple percentage were used to determine the personal information of each respondent, however, figure was assigned to each alternative response for identification and clarity among variables. While sections “B” and “C” were scored using Four Point Likert Type scale which was quantified as follows:
Strongly Agree (SA)        =    4 points
Agreed (A)                =    3 points
Disagreed (D)            =    2 points
Strongly Disagreed (SD)          =    1 point