Math Journal 8-19

Split the space for today’s journal in 1/2. There are 2 problems today.

1. 2.

UNIT 1 DAY 7: USING DATA REPRESENTATIONS

Essential Questions: What different ways are there to represent data? Which type works best for

specific sets of data?

Vocabulary

Quantitative: data where responses are numbers

Qualitative: data where responses are not numbers

Measures of Central Tendency: mean, median, and mode

Bar Graphs

When to use:Specific categories to choose fromYou want to compare the amount in each category visually

When not to use:Free answer categoriesHigh number in each category (forces estimates)

Line Graphs

When to use:Used mainly with one category, but may be used with more than one categoryYou want to see change over time

When not to use:Too many categoriesYou don’t need to calculate exact numbers

Example 1

How many more cookies did the Girl Scouts sell on Friday than on Monday?

About 35

Pie ChartsWhen to use:

More than one categoryYou want to compare categories to each other and to the wholeYou want to be able to calculate exact numbers

When not to use:Too many categoriesYou don’t need to calculate exact numbers

Example 2

Which category used a quarter of the budget?

Which two categories

used the same amount of the

budget?

Hotel

Food and Tickets

Stem and Leaf Plots

When to use:Only one categoryQuantitative dataYou want to see every responseAlmost every response is different

When not to use:More than one categoryQualitative dataYou have a lot of data with the same responses multiple times

Example 3

What is the difference between the highest and

lowest quiz score (range)?

96 - 40

Range: 56

Box-and-Whisker Plots

When to use:Only one categoryYou care about measures of central tendency more than comparing responses visuallyQuantitative data

When not to use:More than one categoryQualitative dataYou don’t want to see how many responses for each number

Venn Diagrams

When not to use:More than 3 categoriesResponders can only choose one response

When to use:2-3 categoriesResponders have the option of “both” or “all”

Summary

Essential Questions: What different ways are there to represent data? Which type works best for specific sets of data?

Use 1 minute to write 2 sentences answering the essential questions.