It can help if the underlying model remains valid. However, extending the period beyond a systematic change is of little use. For example, if studying the relation between age and height of adolescents, extending the data to cover a longer period - into adulthood - would devalue the usefulness of the data. This is because the approximately linear relationship breaks down when the subject reaches adulthood.
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Not specifying the question properly would certainly not help!
They give a visual interpretation of the data.
Bar chart or bar graph
Riding a motorcycle doesn't help to end your period faster.
pictographs can be used in different types of business's to provide data for what they are going to create or work on (it actually depends on the type of business because if it was a manufacturing business the data would help them know how the would like to build their products).