Statistical Graphics SECTION 2-4 37 28. a. The next two rows of the expanded stemplot come from the original 70’s row as follows. 7 | 22222222 7 | 666666 b. The completed condensed stemplot is as follows. FEMALE PULSE RATES stem | leaves .6−7 | 000444488888*22222222666666 8−9 | 00000088888*6 10−11 | 4* 12−13 | 4* 2-5 Critical Thinking: Bad Graphs 1. The illustration uses two-dimensional objects (dollar bills) to represent a one-dimensional variable (purchasing power). If the illustration uses a dollar bill with ½ the original length and ½ the original width to represent ½ the original purchasing power, then the illustration is misleading (because ½ the length and ½ the width translates into ¼ the area and gives the visual impression of 25% instead of 50%). But if the illustration uses a dollar bill with ½ the area (i.e, with .707 of the original length and .707 of the original width) to represent ½ the original purchasing power, then the illustration conveys the proper visual impression. 2. No. Since the data comes from a voluntary response sample it may not be representative of the population. Since the sample may not be representative, even sound graphing techniques will not necessarily provide accurate understanding of the population.