http://www.ck12.org Chapter 2. Visualizations of Data
(d) approximately 1625 ft
- There isn’t necessarily awrongway or right way to create this graph and to interpret the different time
intervals, but a year should be the same distance apart for the entire graph so that the rate of change of
the lines means the same thing across the entire plot. In this case, we plotted the average as a point in
the middle of the five-year interval. It is possible that a student could devise a better representation, as
long as the relationship in the data is clearly and correctly represented.
- There isn’t necessarily awrongway or right way to create this graph and to interpret the different time
- Answers will vary, but comments should focus on features of the plot that are placedin the contextof
the actual situation. For example, the plot of adult salmon increases dramatically after 1995 to a peak
in 2002. This could be due to many factors, one of which was the inclusion of the Chinook salmon
under the endangered species act. The plot for the Jack salmon stays relatively horizontal, indicating
that the Jack population remained relative constant until the most recent downturn. Other comments
could be made and interested students might be encouraged to research things such as climate conditions
or changes in the management of the salmon populations that may have led to the increases or decreases. - (a) The various plots are shown below: