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【正文】 entral tendency of this group of test results using a single score? The mean ? The mean is the arithmetic average ? The most mon measure of central tendency ? Can be calculated by adding all of the scores together and then dividing the sum by the number of scores (. 7) – 4+5+6+6+7+7+7+9+9+10=70/10=7 ? While the mean is a useful measure, unless we also knows how dispersed (. spread out) the scores in a dataset are, the mean can be an uncertain guide The mode and the median ? The mode is the most mon score in a set of scores – The mode in our testing example is 7, because this score occurs more frequently than any other score ? 4, 5, 6, 6, 7, 7, 7, 9, 9, 10 ? The median is the middle score of a set of scores ordered from the lowest to the highest – For an odd number of scores, the median is the central score in an ordered list – For an even number of scores, the median is the average of the two central scores ? In the above example the median is 7 (. (7+7)/2) Measure of dispersion: range ? The range is a simple way to measure the dispersion of a set of data – The difference between the highest and lowest frequencies / scores – In our testing example the range is 6 (. highest 10 – lowest 4) ? Only a poor measure of dispersion – An unusually high or low score in a dataset may make the range unreasonably large, thus giving a distorted picture of the dataset Measure of dispersion: variance ? The variance measures the distance of each score in the dataset from the mean – In our test results, the variance of the score 4 is 3 (. 7–4)。 results and discussions。 literature review。 conclusions。 your critical evaluation of the tool: how well it does the jobs it is supposed to do。 conclusions, bibliography ? CL2021: ? CL2021: ? UCCTS2021: ? UCCTS2021: – Corpus tool: Introduction。Making statistic claims Corpus Linguistics Richard Xiao Update on assignments ? Deadline for submission ( submission) – TBA ? The Harvard referencing style ? Assignment A – Corpus study: introduction。 synopsis / overview, critical review of data, method of analysis, conclusion etc。 description of the tool, its main features and functions。 user interface, powerfulness, etc。 bibliography ? Assignment B – Introduction。 methodology。 conclusions。 and the variance of the score 9 is 2 (9–7) ? For the whole dataset, the sum of these differences is alway
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