Question

how are the numbers of unprovoked shark attacks worldwide for the last several years. why is it that a dotplot of these data would not be very effective in helping us understand the data? which of the following graphs would be most effective for these data: dotplot, stemplot, time - series graph, pareto chart, pie chart, frequency polygon? 54 68 82 79 83 76 73 98 81
○ c. there are several duplicate values in the data and most graphical methods cannot accurately show duplicate values.
○ d. the spread of the data is very small, so it would be nearly impossible to see any differences when represented graphically
which of the following graphs would be most effective for these data: dotplot, stemplot, time - series graph, pareto chart, pie chart, frequency polygon?
○ a. a frequency polygon would be most effective, since the data are listed in order over a period of several years
○ b. a dotplot would be most effective, since it is important to be able to recreate the original list of values
○ c. a pareto chart would be most effective, since the data are categorical data
○ d. a time - series graph would be most effective, since the data are listed in order over a period of several years.
○ e. a pie chart would be most effective, since the data are categorical data
○ f. a stemplot would be most effective, since it is important to be able to recreate the original list of values

Explanation:

Part 1: Why dotplot is not effective (assuming the first part's options, but let's focus on the graph choice)

For the graph choice:

The data is the number of unprovoked shark attacks over several years (ordered by time). A time - series graph is used to display data points in chronological order to show trends over time. A frequency polygon is for showing frequency distributions, a dotplot is good for small datasets to show individual values but not time - based trends, a Pareto chart is for categorical data with frequencies, a pie chart is for showing proportions of a whole (categorical), and a stemplot is for showing the distribution of numerical data but not time - related trends. Since the data is over a period of years (time - ordered), a time - series graph is most effective.

Answer:

D. A time - series graph would be most effective, since the data are listed in order over a period of several years.