Combining Evidence from a Chart and a Passage

A question that pairs a chart with a passage tests whether you can use both sources together. The chart may show a trend while the passage explains a policy or offers an interpretation. Read each source on its own first. Then connect them using the same population, time period, and measure.

Read the chart before interpreting it

Check the title, labels, units, legend, and date range. Determine whether the values are counts, percentages, rates, or averages. A value of 40 percent is not the same as 40 people, and a rate per 1,000 cannot be compared directly with a raw count. Look at the scale: unequal intervals or a vertical axis that starts above zero can make differences look larger or smaller than they are.

Identify exactly what the passage claims

Reduce the passage’s relevant point to one sentence. Is the writer claiming that a value increased, that one group exceeded another, or that a program caused a change? Note whether the claim is limited to a place, group, or year. A broad conclusion needs broader evidence than a statement about one sample.

Connect the sources carefully

1. Match the population and categories. A chart about all residents may not test a claim about first-year students.
2. Match the time period. A single-year chart cannot by itself establish a long-term trend.
3. Use the chart’s actual values and units to verify the direction and size of the difference.
4. Decide whether the chart supports, qualifies, or conflicts with the passage’s exact claim.
5. Choose the narrowest conclusion supported by both sources; leave out unsupported causes or motives.

Example: improvement is not proof of cause

Suppose a passage says that a tutoring program improved reading scores after it began. A chart shows average scores rising from 72 to 76 over two years. The chart supports the claim that scores rose during that period. It does not prove the tutoring caused the increase unless the evidence also rules out other explanations, such as a change in test difficulty or student population.

Common traps

• Quoting a chart value without checking what it measures.
• Treating correlation or timing as proof of causation.
• Comparing percentages with counts or different denominators.
• Selecting an answer that repeats the passage but ignores the chart.
• Choosing a broad claim when the chart covers only a narrow sample.

Give each source a separate job

A question that combines a chart and a passage requires evidence from both. First read the chart title, axes, units, groups, and time period. Then identify the passage’s central claim and any limits it places on the data. A chart may provide a numerical pattern while the passage explains how the measurements were collected or why the pattern matters. Neither source should be treated as decorative.

Suppose a chart shows attendance rates rising from 82% to 89% after a schedule change, while a passage says the district also introduced free transit passes during the same term. A careful synthesis states that attendance rose during the period but does not attribute the full increase to the schedule change alone. The passage supplies a competing explanation that changes what the chart can establish.

Compare quantities on the same basis

Check denominators and scales before comparing categories. A count of 80 complaints from a group of 1,000 people is not directly comparable to 50 complaints from a group of 400; the rates are 8% and 12.5%, respectively. If a graph reports percentages, do not repeat them as counts. If values are indexed to a baseline, explain what the index represents rather than treating it as an absolute number.

Time periods must also match. A passage about annual outcomes cannot be directly supported by a chart showing one month unless the connection is explained. Note whether the chart measures the same population, outcome, and timeframe that the author discusses. Differences can limit the inference even when the trend appears similar.

Build a synthesis with a clear claim

A concise synthesis can follow three steps: state the relevant pattern in the chart, identify the passage’s claim or explanation, and explain how the two relate. They may reinforce, qualify, or conflict with each other. For example, a chart may show average improvement while the passage warns that one subgroup did not improve. A complete interpretation includes the exception instead of claiming uniform success.

Avoid simply listing one statistic and then paraphrasing the passage. Explain what the evidence supports together. Also avoid claiming cause from a before-and-after chart unless the design addresses other possible changes. A measured increase is an observation; a reason for that increase requires additional evidence or an argument in the text.

• Read titles, axes, units, sample, and time period before interpreting values.
• Convert counts to rates when group sizes differ.
• Check that the passage and chart measure compatible outcomes.
• State whether sources reinforce, qualify, or challenge each other.
• Limit the conclusion to the evidence and preserve exceptions.

Resolve apparent conflicts between text and chart

A chart and passage may seem to disagree because they use different definitions, dates, or populations. Before calling them contradictory, compare what each measures. A passage might describe cumulative applications while a chart shows only completed reviews, or the prose may refer to one region while the visual covers all regions. The discrepancy itself may be the important finding.

If the chart supports only part of a claim, state that boundary: “The figure shows a rise among returning applicants; it does not address first-time applicants discussed in the passage.” A careful synthesis can explain what the combined evidence shows and what additional information would be needed.

Exam takeaway

Use both sources, but make each do only the work it can support. A chart can confirm a quantity or pattern; the passage supplies its own claim and context. Your conclusion should fit the overlap between them.