1.1 Constructing and Interpreting Visual

Displays of Data

Definitions Discrete Data:

Continuous Data:

Independent Variable:

Dependant Variable:

Population:   Data:   Sample:

Frequency:

Class interval:

Median:

- data that can only take certain values. Example: the number of students in a class (you can't have half a student).

-data that can take any value (within a range)Example: A person's height: could be any value (within the range of

human heights), not just certain fixed heights.

- variable whose value determines the value of other variables.Answers the question "What do I change?"

- value is determined by the value assumed by an independent variable.Answers the question "What do I observe?”

- refers to the entire group about which data are being collected.Example: In a survey of a school, the staff and students would be the population.

- information providing the basis of a discussion from which conclusions may be drawn.Data often takes the form of numbers that can be displayed graphically or in a table

- part of a population selected so as to gain information about the whole population.Example: In a survey of a school, the staff and students who are asked questions.

- the number of times an event occurs or the number of items in a given category.Example: The number of times students answer “No” to the question “Are you happy to be back at school after the break?”

-a category or division used for grouping a set of observations.

- the middle term in a frequency distribution.Example: 7 in the set of data: 2, 4, 5, 7, 8, 9, 12

Class Interval Frequency

0-25 3

26-50 5

51-75 6

76-100 4

Types of Graphs Organizing Data

Frequency Tables Stem and Leaf Plots

Displaying Data Bar graph Histogram Pictogram Circle graph Broken Line graph

Positive correlations Increase/increase

Negative correlations Increase/decrease

No correlations

Frayer Charts

Frayer Charts of Graph Types1. In expert groups of 3,

you will read the section of the text relating to your assigned graph (pgs 5-9).

2. The group will create a Frayer Chart for your graph type in the format given to the right.

3. In jigsaw groups of 5, you will present your chart (we will need to rotate them) and explain your graph type.

4. Everyone writes the definitions of the various graph types in their notes.

HomeworkPages 11-13 #1, 2, 8