Introduction To Statistics

Chapter 03 Describing Data Visually True / False Questions 1. It is easier to read the data values on a 3D column chart than on a 2D column chart. True False 2. The column chart should be avoided if you are plotting time series data. True False 3. The line chart is appropriate for categorical (qualitative) data. True False 4. The Pareto chart is used to display the "vital few" causes of problems. True False 5. Excel's pyramid chart is generally preferred to a bar chart. True False 6. Excel's pyramid charts make it easier to read the data values. True False 7. Dot plots are similar to histograms with many bins (classes). True False 8. Compared to a dot plot, we lose some detail when we present data in a frequency distribution. True False 9. Stacked dot plots are useful in understanding the association between two paired quantitative variables ( X , Y ). True False 10 . Log scales are common because most people are familiar with them. True False 11 . Sturges' Rule should override judgment about the "right" number of histogram bins. True False 12 . Sturges' Rule is merely a suggestion, not an ironclad requirement. True False 13 . Excel's 3D pie charts are usually clearer than 2D pie charts. True False 14 . A common error with pie charts is using too few "slices." True False 15 . A pie chart can generally be used instead of a bar chart. True False 16 . A bar chart can sometimes be used instead of a line chart for time series data. True False 17 . Pie charts are attractive to statisticians, but are rarely used in business or general media. True False 18 . Pie charts are useful in displaying frequencies that sum to a total. True False 19 . Dot plots may not reveal the shape of a distribution when the sample is small. True False 20 . Scatter plots are used to visualize association in samples of paired data ( X , Y ). True False 21 . The zero origin rule may be waived for bar charts if the objective is merely to visualize relative change over time. True False 22 . In a bimodal histogram, the two highest bars will have the same height. True False 23 . A frequency distribution is a tabulation of n data values into classes called bins. True False 24 . A dot plot would be useful in visualizing scores on an exam in a class of 30 students. True False 25 . A frequency distribution usually has equal bin widths. True False 26 . Line charts are not used for cross-sectional data. True False 27 . A scatter plot is useful in visualizing trends over time. True False 28 . A scatter plot requires two quantitative variables (i.e., not categorical data). True False 29 . The number of bins in this histogram (caﬀeine content in mg/oz for 65 soft drinks) is consistent with Sturges' Rule. True False

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