Bar Charts & Pictograms Flashcards

All 6 cards in this deck

In a bar chart for categorical data, what must be true of the bars?

They must all be the same width, with equal gaps between them.

What is a dual bar chart used for?

Comparing two sets of data across the same categories, using side-by-side bars and a key.

In a composite (stacked) bar chart, how do you find the frequency of the top section of a bar?

Subtract the value where the section starts from the total height of the bar.

In a pictogram, what does half a symbol represent?

e.g. key: one circle $= 10$ people

Half the value in the key — here $5$ people.

What are the steps to draw a bar chart from a frequency table?

e.g. Red $4$, Blue $7$, Green $3$

1. Label the axes: categories along the bottom, frequency up the side
2. Choose a scale that fits the largest frequency: up to $7$
3. Draw equal-width bars with gaps, at heights $4$, $7$, $3$

What kind of data is a vertical line chart used for?

Ungrouped discrete numerical data, e.g. number of pets per household.