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The proportion states the relationship of one part of a measure compared to a whole. In this study, proportion was oftentimes used to depict the picture of the size of the populations of arrestees testing positive for any of the eight substances in the aforementioned paragraph, such as “ … three out of four arrestees tested positive for at least one drug (including alcohol)” (p. The median in this study describes the midpoint of the range where half of the data contained in the range falls below the median and the other half falls above the median. For example, “… the proportion testing positive for any of the drug types tested ranged from 72 per cent and 82 per cent, with a median value of 74 percent…” (p. With the median for this particular data at 74 percent, it means that half of the data falls below 74 per cent with the lowest at 72 per cent; while the other half of the data falls above 74 per cent with the lowest at 82 per cent. Frequency is the number of times a particular data occurred in a given study. In Table E. 104), in the self-report, there were only 7 occurrences of arrests with a drug supply offense only and this accounts for a frequency of 7. Percentage is an expression a frequency as a fraction of 100. A frequency of 7 from a total frequency of 123 in Table E.1 means a percentage of 5.7 or 6 per cent.measure the assumption that the distribution characteristics namely gender, age, ethnic group and suspected offense of the arrestees considered in the study. The chi-square test is believed to be the most appropriate statistical test for the inferential part of the study since it compares the observed frequencies in one specific categories to frequencies which the researcher may expect to fall in these categories by chance. Further, the assumptions of normality which are usually required when using the t-test or the analysis of variance, is not required in using the chi-square test (Field, 2005).The Greenblatt (2002) research studied the relationship between adolescent behaviors and marijuana. It utilized a methodology developed using a combination of household interviews and compiled historical data. Respondents for the household interview were sourced from non-institutional group accommodations such as shelters and dormitories.Aside from measures of central tendency using frequency and the percentage [the definition of which were already both discussed in the Bennett (2004)

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