Question

What type of graph to use? Example: Ten water samples are taken at each of four locations in a lake (North, South, East & West) and the quantity of dissolved oxygen is recorded in mg/L. Interest centers on deciding whether there are statistically significant differences between the level of water pollution across the four locations in the lake. Which type of chart would you use for the quantity of oxygen dissolved in water?

A. Scatter plot
B. Pie chart
C. Box plot
D. ANOVA plot

Answer 1

The appropriate type of graph to use for comparing the level of water pollution across the lake's four locations is a box plot.

Step-by-step explanation:

The appropriate type of graph to use for comparing the level of water pollution across the four locations in the lake is a Box plot. A box plot displays the median, quartiles, and any outliers in a dataset, making it ideal for showing the distribution and range of data.

In this case, the quantity of dissolved oxygen recorded in mg/L at each location can be plotted on the y-axis, while the four lake locations can be plotted on the x-axis. The box plot will allow us to visually compare the median and spread of dissolved oxygen levels across the different locations.

Using a box plot for the quantity of oxygen dissolved in water allows us to determine if there are statistically significant differences between the levels of water pollution across the four lake locations.