Data Interpretation — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A histogram groups data into equal ranges called bins.
Bins, also called intervals, organize numerical data on histograms.
2. On a box-and-whisker plot, the line inside the box marks the median.
The median splits a data set into a lower and upper half.
3. A histogram with bars touching shows that the data is continuous rather than separate categories.
Continuous data uses ranges, while categories use separated bars.
4. The lower edge of the box on a box plot represents the first quartile.
Q1 separates the bottom 25% from the rest of the data.
5. On a histogram with bins 0-10, 10-20, and 20-30, the value 14 falls in bin 10-20.
Each bin contains a defined range, and 14 sits between 10 and 20.
6. A bar graph for favorite sports uses categories, while a histogram for ages uses intervals.
Histograms handle numerical groups; bar graphs handle named groups.
7. The whiskers on a box plot extend to the minimum and maximum values.
Whiskers show data spread beyond the middle 50% of values.
8. If a histogram bin 50-60 has height 12, then 12 data points fall in that range.
Histogram heights are counts of values inside each interval.
9. A graph that best shows change over time is a line graph.
Line graphs reveal trends as values rise or fall over time.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Histogram
→ Numeric data grouped into intervals
Numeric data grouped into intervals
Box-and-whisker plot
→ Median, quartiles, and data spread
Median, quartiles, and data spread
Bar graph
→ Compare separate categories
Compare separate categories
Line graph
→ Show changes across time
Show changes across time
Different graphs suit different data, so picking the right one is key.