Data Interpretation — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. If you survey 50 students about favorite colors, the best display is a bar graph.
Bar graphs compare named categories with separated bars and easy reading.
2. To show how a plant's height changed each week for 10 weeks, use a line graph.
Line graphs show trends and growth across ordered time periods.
3. To group test scores into ranges of 10, the right display is a histogram.
Histograms group numerical data into bins for distribution views.
4. On a box plot, the box length from Q1 to Q3 shows the interquartile range.
Interquartile range describes spread by ignoring the most extreme values.
5. If a histogram bin 70-80 holds 9 scores and bin 80-90 holds 4 scores, 13 scores were 70 to 90.
Histogram totals across nearby bins give cumulative range counts.
6. A box plot's median sits to the right of center when the data is skewed left.
Skewness direction follows the longer whisker, opposite the median pull.
7. The best way to compare boys and girls in two histograms is to use the same bins.
Equal intervals let two histograms be compared fairly side by side.
8. If Q1 is 12 and Q3 is 28 on a box plot, the interquartile range equals 16.
IQR equals Q3 minus Q1, measuring middle half spread.
9. A pie chart works best when each slice represents a percent of the total.
Pie charts show how parts of a single whole are distributed.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Daily temperatures for one month
→ Line graph
Line graph
Favorite ice cream flavors
→ Bar graph
Bar graph
Distribution of class heights
→ Histogram
Histogram
Yearly budget categories
→ Pie chart
Pie chart
Choosing the right graph makes the data's story easier to see.