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Q15: Which of the following data organization schemes is useful in showing changes in data relationships over time? A. bar graph B. pictogram C. line graph D. pie chart E. scatterplot F. none of the above Q16: Which of the following is/are necessary for properly displaying a statistical plot, picture, or graph? A. a title B. a source C. proper labeling of the axes D. proper labeling/representation of the pie segments, bars, etc. E. All of the above Q17: A pie chart would be most appropriate with which of the following statistical tests? A. chi-square goodness-of-fit B. chi-square test for independence C. correlation The following 3 questions (Q18 to Q20) are either "True" or "False" Q18: Bar graphs are useful to represent two or more measurement variables. Q19: 'Chart-junk' should be used in all statistical plots, pictures, and graphs. Q20: A chi-square test is appropriate with categorical variables