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**Hint:**A diagram is a symbolic representation of information using visualization techniques. Diagrams can be classified based on shape and activity. In statistics, diagrams or charts are classified as simple bar chart, multiple bar chart or cluster chart, stacked bar chart or sub-divided bar chart or component bar chart, simple component bar chart, percentage component bar chart, subdivided rectangular bar chart and pie chart.

**Complete step-by-step solution:**

We know that there are many type of diagrams which are two-dimensional figures. A diagram is a symbolic representation of information using visualization techniques. We can classify diagrams based on shape as block, cycle, cluster, ladder, network, round, spiral, timeline, tree and triangular. We can also classify diagrams based on concept as activity, comparison, decision, explanatory, flow, phase, state, process and timing.

In statistics, diagrams or charts are classified as simple bar chart, multiple bar chart or cluster chart, stacked bar chart or sub-divided bar chart or component bar chart, simple component bar chart, percentage component bar chart, subdivided rectangular bar chart and pie chart.

We can define a bar chart or bar graph as a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent. An example of a bar diagram is shown below.

We can define a pie chart as a circular statistical graphic, which is divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice, is proportional to the quantity it represents. An example of a pie chart is shown below.

Therefore, there is more than one type of diagram. Hence, the given statement is incorrect.

**Note:**There are many types of diagrams or charts in statistics that are used to compare things. Another interesting diagram is the Venn diagram that we use to show the relationships among things or finite groups of things. We mainly use Venn diagrams in sets to show the relationship between two sets.

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