Data Interpretation accounts for 6 questions per GRE Quant section, testing your ability to synthesize visual information rapidly. Master bar and stacked segment reading, pie chart proportions, double-axis line plots, and the 5-second mental estimation rule.
Master vertical, horizontal, and clustered bars. Understand the vital baseline subtraction rule for middle segments in stacked bar graphs.
Data Interpretation accounts for roughly 6 questions per GRE Quant section (typically two 3-question sets based on graphical exhibits). Bar graphs are the most frequent display format, designed to test rapid category comparison, segment extraction, and scale verification.
Discrete bars comparing quantities across categories or years. In clustered bars, multiple adjacent bars represent sub-groups (e.g., Domestic vs. International sales) for each year.
A single bar divided into distinct colored segments. Total height represents the total sum; each internal segment represents a component subtotal.
Every bar has an identical total height ($100\%$). Slices indicate the percentage share of each component, not the absolute magnitude.
In a stacked bar graph, students frequently read the top edge of a middle segment and mistakenly assume that is the value of the segment:
$$\text{Value of Middle Segment} = \text{Upper Boundary Level} - \text{Lower Boundary Level}$$
If the upper edge of Division B reaches the \$120M mark and its lower edge rests on the \$70M line, Division B did not produce \$120M; it produced exactly $\$120\text{M} - \$70\text{M} = \mathbf{\$50\text{M}}$.
Convert sector degrees to percentages without errors, avoid the missing total fallacy across pie charts, and master the 3-second scale check on double-axis graphs.
Circle graphs (pie charts) and line plots test your ability to synthesize proportions and track rates of change across continuous time intervals. ETS sets high-yield traps around missing base totals and dual vertical axes.
A full circle comprises $360^\circ$, representing exactly $100\%$ of the whole. Converting between sector degrees and percentage shares is an essential GRE skill:
A $90^\circ$ right-angle slice is $25\%$; a $72^\circ$ slice is exactly $20\%$; a $36^\circ$ slice is $10\%$.
Trap Question: "Company A had a 40% slice of Market 1, while Company B had a 15% slice of Market 2. Did Company A generate more revenue than Company B?"
Never assume! If Market 1 was worth \$10M (Company A = \$4M) and Market 2 was worth \$100M (Company B = \$15M), Company B generated nearly 4x more revenue despite having a smaller percentage slice!
Line graphs visualize data trends over time. When two related variables are plotted together on a Double-Axis (Dual Y-Axis) Graph, extreme caution is required:
Measures physical units (e.g., Millions of Barrels, Number of Students). Points connected by a solid line correspond to this scale.
Measures financial rates or percent changes (e.g., \$ Price Per Unit, Inflation %). Points connected by a dashed line correspond to this scale.
Because the GRE is taken on a computer screen, you cannot mark up the graph directly. Before doing any calculations on a dual-axis question, take 3 seconds to jot down a quick mapping on your scratch paper (for example: Solid Line = Left Axis (Volume), Dashed Line = Right Axis (Price)). Reading a curve from the wrong vertical scale is the #1 source of careless errors in GRE Data Interpretation!
Learn how to identify row vs column denominators in two-way tables, and chain information across two paired exhibits using the two-step strategy.
The hardest Data Interpretation questions on the GRE typically involve Multi-Exhibit Displays (pairing two related exhibits, such as a Bar Chart of historical revenue alongside a Pie Chart of budget allocation) or dense Two-Way Tables. Success requires mastering denominator identification and two-step data chaining.
In tabular cross-tabulations, questions hinge entirely on selecting the correct denominator (the base of the fraction):
The denominator is strictly restricted to Group X (a single row or column total).
The numerator is the same, but the denominator changes completely to Group Y!
The denominator is the grand total of all rows and columns combined.
When ETS presents two exhibits together, advanced questions require you to chain information from Exhibit 1 into Exhibit 2:
Shows Total Corporate Budget by Year. (In 2023, Total Budget = \$80 Million).
Shows 2023 Budget Allocation by Department. (R&D slice = 15%).
Question: How much money was allocated to R&D in 2023?
Step 1: Look at Exhibit 1 to extract the absolute total for 2023: $\text{Total} = \$80\text{M}$.
Step 2: Look at Exhibit 2 to extract the 2023 R&D percentage: $15\%$.
Step 3: Multiply: $\$80\text{M} \times 0.15 = \mathbf{\$12\text{ Million}}$.
*Takeaway: Neither exhibit alone has enough information to answer the question. You must chain the total from Exhibit 1 with the proportion from Exhibit 2.
Master the distinction between percentage change and percentage points, spot truncated axis illusions, and apply the 5-second mental estimation rule.
Classic GRE Trap Scenario:
In 2020, $20\%$ of a company's workforce worked remotely. In 2023, $25\%$ of the workforce worked remotely.
Many students calculate $25\% - 20\% = 5\%$ and choose 5%.
$5$ is the difference in percentage points, NOT the percentage change of the rate itself!
Percentage change always equals $\frac{\text{New} - \text{Old}}{\text{Old}} \times 100\%$:
The share of remote workers grew by 5 percentage points, but it increased by 25% relative to its initial value!
Share this guide with your WhatsApp group or study buddy to compare problem-solving methods and benchmark your pace on the timed practice drills.
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