Graphs Quiz

What type of graph is used to show the relationship between two variables?

• scatter plot

• pie chart

• line graph

• bar graph

Answer explanation

A scatter plot is the correct answer because it is the type of graph that is specifically designed to show the relationship or correlation between two variables. The other options, such as pie chart, line graph, and bar graph, are used for different data representation purposes.

Which type of graph is best suited for comparing different categories or groups?

• line graph

• pie chart

• bar graph

• scatter plot

Answer explanation

The question asks for the type of graph best suited for comparing different categories or groups. A bar graph is the correct choice because it easily allows for comparison between different groups. Each bar represents a group or category, and the height or length of the bar corresponds to the value of that group, making it easy to compare across different categories.

What type of graph is used to show the distribution of a whole into parts?

• Scatter plot

• Pie chart

• Bar graph

• Line graph

Answer explanation

A Pie chart is used to show the distribution of a whole into its constituent parts. Scatter plot, Bar graph, and Line graph are primarily used for representing and comparing different data points or trends over time. They do not typically represent parts of a whole. Therefore, the answer to the question, 'What type of graph is used to show the distribution of a whole into parts?' is 'Pie chart'.

In a line graph, what does the x-axis represent?

• The independent variable

• The title of the graph.

• The y-axis.

• The dependent variable.

Answer explanation

In a line graph, the x-axis typically represents the independent variable. It is the variable that stands alone and isn't changed by the other variables you are trying to measure. For example, time is a common independent variable.

In a bar graph, what does the height of each bar represent?

• The position of the bar on the graph.

• The width of the bar.

• The color of the bar.

• The value or quantity of the corresponding category or variable being measured.

Answer explanation

In a bar graph, the height of each bar represents the value or quantity of the respective category or variable being measured. This is distinct from the bar's position, width, or color, which do not reflect the measured quantity. Hence, the correct answer implies that the height of the bar directly correlates with the value it represents in the data set.

Which type of graph is used to show changes over time?

• scatter plot

• pie chart

• line graph

• bar graph

Answer explanation

A line graph is used to display information that changes over time. Although bar graphs can also be used, they are typically used for comparing things in categories, not changes over time. Scatter plots are used for correlation and distribution, and pie charts for percentages of whole, not for showing change over time. Hence, the correct answer to this question is a line graph.

What is the main purpose of a pie chart?

• To display numerical data in a graphical format.

• To show the relationship between two variables.

• To visually represent the distribution or proportion of different categories or parts of a whole.

• To compare different data sets.

Answer explanation

A pie chart's primary function is to visually illustrate the distribution or proportion of different categories or parts within a whole. It provides a visual representation, making it easier to see the difference in proportion between categories. This option is correct because it accurately describes the main use of a pie chart.

In a line graph, what does the y-axis represent?

• Dependent variable

• X-axis

• Time

• Independent variable

Answer explanation

In a line graph, the y-axis typically represents the dependent variable. It's the variable that we observe and then try to measure based on the changes in the independent variables. So the correct answer is 'Dependent variable'.

Which type of graph is used to show the frequency or count of different categories?

• scatter plot

• bar graph

• pie chart

• line graph

Answer explanation

A bar graph is used to show the frequency or count of different categories. Scatter plot, pie chart, and line graph can also represent different types of data, but for specifically showing the frequency or count of categories, a bar graph is the most appropriate.

What is the key feature of a bar graph?

• Curved bars

• Rectangular bars

• Circular bars

• Triangular bars

Answer explanation

The key feature of a bar graph, as per the question, is the utilization of rectangular bars. This is emphasized by the correct choice 'Rectangular bars'. Bar graphs are not represented by curved, circular, or triangular bars. The distinctive feature of rectangular bars helps in the visual comparison of data in different categories.