Before you can decide if a question is statistical (it expects lots of different answers), you need to be comfortable collecting and counting data — making tally marks, counting up a list, and reading a simple bar graph. Warm those up and statistical questions click.
Answer these 3, then press Show my path. No grade — this just points you to the right level.
1. How many tally marks are here: |||| | (a group of 4 plus 1 more)?
2. What is 3 + 4 + 2?
3. A bar graph shows: Dogs = 5, Cats = 3. How many more dogs than cats?
Data is information you collect — like everyone's favorite color or how many pets each kid has. You often count it with tally marks (groups of 5) and show it in a bar graph.
Your quick check picks one for you, but you can switch any time:
Level 0 Let's count one group at a time.
A. How many marks in one full tally group?
A full tally group is 4 lines plus 1 slash = 5.
B. Count these tallies: ||| (three marks). How many?
Count each line: 1, 2, 3.
C. Add this short list: 2 + 1 + 2 = ___
2 + 1 = 3, then 3 + 2 = 5.
Level 1 Count, add, and compare.
A. A survey of pets gives: 2, 3, 1. What is the total number of pets?
2 + 3 + 1 = 6.
B. Which question expects many different answers (data that varies)?
Students have different heights, so that answer varies. The others have one fixed answer.
Level 2 Read data and compare.
A. Bar graph counts: 4, 6, 3, 2. What is the total?
4 + 6 = 10, + 3 = 13, + 2 = 15.
B. The tallest bar is 6 and the shortest is 2. What is the difference?
6 − 2 = 4.
1. Add the data list: 5 + 2 + 4 = ___
5 + 2 = 7, then 7 + 4 = 11.
2. Which is a statistical question (answers vary)?
Sleep hours differ from kid to kid, so it varies — that's statistical.
You've practiced exactly what Lesson 8-1 uses. Time to dive in.
Start Lesson 8-1 →