Question

1. the graph below is based on the rat in a maze data at left. what is wrong with the graph?

a. the graph has no title.
b. there are no units on the vertical axis label.
c. a poor choice of scale was made for the vertical axis.
d. all of the above.

1. what is the best type of graph for the data set below?

a. line graph
b. bar graph
c. scatter plot
d. pie graph

Explanation:

• Question 26:
• A graph should have a title to clearly indicate what the data represents. Here, the graph has no title.
• The vertical - axis label (\(y\) - axis) should have units (in this case, time units like seconds or minutes as the data is about time in a maze).
• The scale on the vertical axis: The maximum value in the data is \(48\), but the vertical axis goes up to \(200\), which is a poor choice of scale as it makes the data points seem too compressed at the bottom.
• Question 27:
• A pie graph is used to show the proportion of different parts to a whole. The data set shows the percentage of total sales for different products (the whole is the total sales of Acme Co., and each product's percentage is a part of that whole). A line graph is for showing trends over a continuous variable (e.g., time), a bar graph is more for comparing discrete quantities (not as good for showing proportion to a whole as a pie chart), and a scatter plot is for showing the relationship between two variables.

Answer:

• Question 26: D. All of the above
• Question 27: D. Pie graph