Reading a categorical graph

Problem types

• Read a picture graph
• Tally charts and T-charts
• Summarize categorical data
• Which table fits the survey?

Builds on

• Sorting and counting
• Adding within 10 · Useful idea

  The total of two categories in a picture graph is found by joining their counts.

• Comparing length, weight, and capacity · Useful idea

  Sorting objects by a measurable attribute like length or weight makes the categories that a picture graph counts.

• Comparing two groups by matching · Useful idea

  Deciding which category has more or fewer uses the same group comparison, applied to counts in a picture graph.

Leads to

• Picture graphs and bar graphs
• Asking a statistical question
• Equations for addition and subtraction stories · See it applied

  Questions about a picture graph, such as how many in all, are addition stories about the categories.

• Association in a two-way table · Extend the idea

  Counting each category in a picture graph extends to relative frequencies, which compare the share of each category within a group.

Related skills

None listed.