令和5年度 ITパスポート試験問27

This question's explanation and your answers so far.

問27

頻出度★★★

ファミリーレストランチェーンAでは，店舗の運営戦略を検討するために，店舗ごとの座席数，客単価及び売上高の三つの要素の関係を分析することにした。各店舗の三つの要素を，一つの図表で全店舗分可視化するときに用いる図表として，最も適切なものはどれか。

出典　令和5年度 ITパスポート試験問27

解説

問 27

Incorrectア
A Gantt chart is a schedule-management chart that uses horizontal bars to show the start and end timing and the progress of tasks or processes. It shows progress along a time axis, so it is not suited for visualizing the relationship among the three quantitative factors of the number of seats, the average spend per customer, and the sales revenue.
イ
正解 A bubble chart can express a third quantity through the size of a circle (bubble), in addition to its two axes (horizontal and vertical). In this problem, by assigning the number of seats to the horizontal axis, the average spend per customer to the vertical axis, and the sales revenue to the size of the bubble, the relationship among the three factors can be visualized for all stores together in a single chart. Because the correlation among the three variables can be seen at a glance, the most appropriate answer is the bubble chart, “イ”.
Incorrectウ
A mind map is a diagram for brainstorming and organizing thoughts, in which related words and ideas branch out radially from a central theme. It does not represent the relationship among numerical data, so it is inappropriate.
Incorrectエ
A roadmap is a chart that shows plans such as goals, measures, and target timing along a time axis. It represents the path forward into the future, so it does not fit the purpose of showing the correlation among the three quantitative factors in a single chart.

ここがポイント

In addition to its two axes (horizontal and vertical), a bubble chart can express a third variable through the size of the circle, so it can visualize three quantitative factors simultaneously in a single chart.
It is important to distinctly remember each chart's purpose and suitable use, such as the Gantt chart (process management), the mind map (idea organization), and the roadmap (plan presentation).

用語

解答問27イ