Chart assignment

Charts to read and discuss

Read each chart, then answer its questions. Every chart shows its source and date; open it for a table of the numbers and the data to download.

  1. Which everyday prices rose the most over the past year?
  2. Are U.S. roads getting safer per mile driven?

Chart 1 of 2 · Inflation

Which everyday prices rose the most over the past year?

The interactive chart needs JavaScript. The numbers are on the chart's page.

In the 12 months to September 2026, the biggest price changes were for gasoline (34.2%) and airline fares (22.4%), while overall inflation was 3.7%. At the other end were eggs (-20.6%) and car insurance (-5%). Each bar compares the Consumer Price Index for the item in one month with the same month a year earlier.

Questions to discuss

  1. In one sentence of your own, what does this chart show?
  2. Find the biggest change or difference in the chart. What might explain it?
  3. Who collected these numbers, and how recent are they? What else would you want to know before drawing a conclusion?

Source: U.S. Bureau of Labor Statistics, Consumer Price Index (CPI-U) (Public domain (U.S. government work)) · Data as of Sep 30, 2026

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Chart 2 of 2 · Road safety

Are U.S. roads getting safer per mile driven?

The interactive chart needs JavaScript. The numbers are on the chart's page.

In 2024 there were 1.19 deaths for every 100 million miles driven, down from 3.35 in 1980. The lowest rate was 1.08 in 2014; it jumped to 1.34 in 2020, when people drove less but deaths rose. Miles driven are the Federal Highway Administration's estimates.

How to read this chart

Each point is the number of people killed in traffic crashes for every 100 million miles Americans drove that year. Dividing by miles driven turns a count into a rate, so years when people drove more or less can be compared fairly.

Questions to discuss

  1. About what fraction of the 1980 rate is the rate in the latest year?
  2. In 2020 people drove less, but the rate went up. What could explain that?
  3. Why is deaths per mile a fairer way to compare years than the total number of deaths?

Source: NHTSA Fatality Analysis Reporting System (FARS) and FHWA Highway Statistics (table VM-2) (Public domain (U.S. government work)) · Data as of Dec 31, 2024

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