Statistics Questions & Answers

Statistics Questions & Answers A biased sample is one that - ANSWER: will likely have groups from the population overrepresented or under-represented due to systematic sampling factors. Only when the sampling is systematically favoring one group or another is the sample biased. Random samples, although they can be different from the population, are not biased. Bias is defined by the procedure for drawing the sample, not by the result. A box plot always indicates the highest and lowest values. - ANSWER: True .If the highest value is an outside (or far out) value then it is indicated by an "o" (or an "*"). If highest value is not an outside value then then it is indicated by the top of the higher whisker (the upper adjacent value). The same goes for the lowest value. A frequency polygon is very similar to a - ANSWER: Histogram, Frequency polygons do not list the raw data, as stem and leaf plots do. Frequency polygons are very similar to histograms, except histograms have bars and frequency polygons have dots and lines connecting the frequencies of each class interval. A graph with a large lie factor omits data that do not fit the hypothesis. is distorted because the baseline is not zero. greatly exaggerates differences by comparing areas instead of heights. - ANSWER: Although all of these choices refer to misleading ways that graphs can be constructed, the term "lie factor" refers to the ratio of the size of the effect shown in a graph to the size of the effect shown in the data. When relevant pictures, as opposed to simple bars, are used in graphs, the heights of these pictures may accurately portray the data, but their area differences could be extremely misleading.