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幼儿园至二年级Probability & Statistics计划中

Data, tallies and picture graphs

Asking questions, collecting data by counting, sorting answers into categories, recording with tally marks, and showing results in picture graphs.

math.prob.data-and-tallies

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前置知识

Counting

2 项必需的前置知识（一直追溯到底）

你将学会

  • Collect answers to a simple question and sort them into categories.
  • Record counts with tally marks and show them in a picture graph or block graph.
  • Answer 'how many more' and 'which is most' questions from a graph.

定义

  • Data are pieces of information collected to answer a question.
  • A tally mark records one item; tallies are grouped in fives to make counting easier.
  • A picture graph uses one picture for each item, or for a fixed number of items.

定理

  • If every answer goes into exactly one category, the category totals add up to the number of answers collected.
  • Comparing categories by the length of a row of pictures is reliable only when the pictures are the same size and evenly spaced.

常见误解

  • Comparing rows of pictures of different sizes by their length.
  • Counting one answer in two categories.

通向

Data displays and the mean as a fair share

可选发现