# Data Management - PowerPoint PPT Presentation

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Data Management. Interpreting Data. Learning Goals. Tables, pictographs, bar graphs, and circle graphs each show data in an organized way. The title of the graph tells you what data are displayed. Data presented in graphs, and tables can be used to make inferences and draw conclusions.

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Data Management

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## Data Management

Interpreting Data

### Learning Goals

• Tables, pictographs, bar graphs, and circle graphs each show data in an organized way.

• The title of the graph tells you what data are displayed.

• Data presented in graphs, and tables can be used to make inferences and draw conclusions.

• Different types of graphs can present the same data differently.

### Questions to consider...

• Why do people need to collect data?

• (to help them make decisions; to improve products; to find out what people like or use the most)

• What are some ways companies might collect data?

• (through telephone surveys; mail-out surveys; by asking people at random on the street)

• What things could the principal ask the students at this school to help her make decisions?

• (how should we encourage more students to be more positive role models? Should we have a bake sale during lunch and have the profits go to local charities or school trips?)

### Terms to Know

Range tells how spread out the numbers in a set of data are. It is found by subtracting the least value (smallest number) from the greatest value (largest number).

For example:

2, 5, 11, 15, 20

20-2=18

The range is 18

Inference: An inference is a conclusion we reach by reasoning. It is the act of coming to a logical conclusion without actually eye witnessing or having first hand knowledge of certain events.

Examples:

1. The baby was asleep upstairs in his bed. Suddenly, I heard a loud, "THUMP!" and he began crying hysterically. I ran upstairs because I inferred that he fell out of bed.

2. In third grade, you cannot be promoted to fourth grade unless you pass the final exam. My classmate said she was going back to third grade again. I know she's got o.k. grades, so inferred that she failed her final exam.

3. Just because the famous actor was seen in a jewelry store, all the tabloids inferred he's going to ask his singer girlfriend to marry him.

### Lesson 1: Interpreting Data

Ani’s school raised funds for charity. She graphed some of the data.

What does a bar graph need in order for us to be able to interpret it? Pie Graph?

1.Use the bar graph.

a)Which two rooms together raised about the same amount as Room 6?

• Suppose all the classrooms that took part in the Craft Sale are shown on the graph. About how much money was raised in all at the Craft Sale?

2.Use the circle graph.

a) Which fundraiser raised the most money? Explain

b)Which fundraisers raised about the same amount of money?

c)Use the answer to question 1b to estimate the amount raised:

•by the Bike-A-Thon

•by all the fundraising activities together

### Homework

• Pgs 170-171; Q’s 1-5