d normally distributed. The curve is symmetric about the line where x = m, m is the mean as well as the median. The right and left tails of the distribution become ever closer to the x-axis but never touch it. ! The standard normal distribution has mean 0 and standard deviation 1. The following fifigure shows the distribution, including approximate probabilities corresponding to the six intervals shown. 0.02 –2 –1 0 1 2 0.02 0.14 0.14 0.34 0.34 Graphical Representations of Data ! Graphical data presentations, such as bar graphs, circle graphs, and line graphs, are drawn to scale; therefore, you can read, estimate, or compare data values by sight or by measurement. ! Standard conventions apply to graphs of data unless otherwise indicated. For example, a circle graph represents 100 percent of the data indicated in the graph’s title, and the areas of the individual sectors are proportional to the percents they represent. Scales, grid lines, dots, bars, shadings, solid and dashed lines, legends, etc., are used on graphs to indicate the data. Sometimes, scales that do not begin at 0 are used, and sometimes broken scales are used. ! In Venn diagrams, various sets of objects are represented by circular regions and by regions formed by intersections of the circles. In some Venn diagrams, all of the circles are inside a rectangular region that represents a universal set. A number placed in a region is the number of elements in the subset represented by the smallest region containing the number, unless otherwise noted. Sometimes a number is placed above a circle to indicate the number of elements in the entire circle. Miscellaneous Guidelines for Interpreting and Using Information in Test Questions ! Numbers given in a question are to be used as exact numbers, even though in some real-life settings they are likely to have been rounded. For example, if a question states that “30 percent of the company’s profifit was from health products,” then 30 is to be used as an exact number; it is not to be treated as though it were a nearby number, say 29 or 30.1, that has been
Anderson老师
{教授课程}: 英联邦雅思及北美留学托福,SAT, GRE, GMAT, SSAT培训,
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