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5 Chapter MULTIPLE CHOICE 1. Which measure would be best for comparing marks on several math tests? A. range B. mean C. median D. mode 2. For this set of data, what are the mean, median, and mode, respectively, to one decimal place? 2, 4, 6, 6, 7, 8, 10, 12, 15 A. 70, 7.8, 6 B. 7.8, 7, 6 C. 6, 7, 7.8 D. 7.1, 7, 6 3. Which of these is a feature of a histogram but not of a frequency polygon? A. Data is organized into 5 to 12 equal-sized intervals. B. The frequencies of values that fall within each interval are recorded. C. The frequency data is plotted on the vertical axis. D. The data is represented by bars. 4. What is the expression for calculating the standard deviation of a set of data? A. E( x - X)2 B. E( x - x)2 CE(x - *)2 n n D. ( x - * ) 2 5. Which set of percents correctly describes the distribution of data one, two, and three standard deviations about the mean in a normal distribution? A. 34%, 50%, 52.35% C. 68%, 95%, 99.7% B. 68%, 95%, 100% D. 95%, 99.7%, 100% 6. Which is the correct formula for calculating a z-score? A. z = - x - u B. 2 = M - x C. z = - D.