(Program 4-4) Smile NGO has participated in a three week cultural mela. Using Pandas, they have stored the sales (in Rs) made day wise for every week in a CSV file named "MelaSales.csv", as shown in Table 4.6.
Table 4.6 -- day-wise mela sales (in Rs):
| Week 1 | Week 2 | Week 3 |
|---|---|---|
| 5000 | 4000 | 4000 |
| 5900 | 3000 | 5800 |
| 6500 | 5000 | 3500 |
| 3500 | 5500 | 2500 |
| 4000 | 3000 | 3000 |
| 5300 | 4300 | 5300 |
| 7900 | 5900 | 6000 |
| Depict the sales for the three weeks using a Line chart. It should have the following: (i) chart title as "Mela Sales Report" (ii) x axis label as "Days" (iii) y axis label as "Sales in Rs". Line colours are red for week 1, blue for week 2 and brown for week 3. |
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Pie Chart Misuse
Imagine you're at a family dinner and someone cuts a cake into slices. If the cuts are uneven, one slice might look huge while another looks tiny — but what if the person serving you intentionally made one slice look bigger than it really is, just to make you think you're getting more? That's the basic idea behind pie chart misuse.
A pie chart is meant to show parts of a whole — each slice represents a percentage, and all slices together must add up to 100%. The visual appeal of a pie chart is that you can instantly compare sizes. But that same visual appeal can be twisted to mislead.
What Exactly Is Pie Chart Misuse?
Pie chart misuse happens when a pie chart is designed or presented in a way that distorts the true proportions of the data. The chart looks like it's showing you something clear, but in reality it's exaggerating, hiding, or confusing the actual numbers.
The most common forms of misuse are:
- Slices that don't add up to 100% — If the total is 120%, the chart is simply wrong. A reader might not notice and assume the proportions are correct.
- Too many slices — When a pie has more than five or six slices, it becomes impossible to compare sizes accurately. The human eye struggles to tell the difference between a 12% slice and a 14% slice.
- 3D effects — A 3D pie chart tilts the perspective. Slices at the front look bigger than they are, and slices at the back look smaller. This is a deliberate visual trick.
- Exploded slices — Pulling one slice away from the rest makes it stand out, even if its actual share is small. The reader's attention is drawn to it, creating a false impression of importance.
- Starting point manipulation — Normally, a pie chart starts at 12 o'clock and goes clockwise. If you start at a different angle, you can make a particular slice appear first or last, which subtly influences how people perceive it.
- Comparing two pie charts side by side — If the two pies are different sizes (different totals), the slices cannot be compared visually. A 20% slice in a small pie looks tiny, while the same 20% in a large pie looks big — but both represent the same proportion.
The core principle is this: a pie chart should only be used when you have a small number of categories (ideally 2–5) that add up to 100%, and when you want to show relative proportions, not absolute values. Any deviation from this invites misuse.
Why Does It Matter?
In commerce and humanities, you will encounter pie charts in newspapers, business reports, government budgets, and marketing materials. They are used to persuade — to make you believe something about spending, market share, population distribution, or survey results. …
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