Topic 5

Question 1

Primary Source

Answer 1

interviewing people or observing something

Question 2

Secondary Source

Answer 2

data collected/created by someone else

Question 3

CENSUS

Answer 3

collecting data from every person in a population (e.g. all of year 11).

Question 4

SAMPLE

Answer 4

collecting data from part of the population (e.g. just our class).

Question 5

Random Sample

Answer 5

Members of the population have an even chance of being selected (e.g. lotto)

Question 6

Stratified Sample

Answer 6

process of dividing a group into subgroups with the same characteristics before we draw our random sample. Then we look at the size of each subgroup as a fraction of the total population

Question 8

Self-selected Sample

Answer 8

A sample the participants choose to be a part of

Question 9

QUANTITATIVE

Answer 9

Numerical data – e.g. height, weight

discrete and continuous

Question 10

discrete data

Answer 10

QUANTITATIVE

can only take exact numerical values
(e.g. the number of people in the room).

Question 11

Continuous

Answer 11

QUANTITATIVE: can take any numerical value
(e.g. height can be 172.5cm, 173.2cm etc.)

Question 12

CATEGORICAL

Answer 12

Data that can be divided into categories – uses labels, not numbers

Nominal and ordinal

Question 13

Nominal

Answer 13

CATEGORICAL:

uses name/label that does not indicate order
(e.g. ‘F’ for Females, ‘M’ for males).

Question 14

Ordinal

Answer 14

CATEGORICAL:

Uses name/label that does not indicate order

Question 15

DOT PLOTS

Answer 15

• Each dot is a data point.
• The same data points are stacked.
• Keep everything in line!

Question 16

STEM-AND-LEAF PLOTS:

Answer 16

• Stem represents the 10’s digit, leaf represents the units.
• Each number in the leaf column represents one piece of data.
• A blank space means there are no data values in that lot of 10’s.
• A zero still represents a data value: 0, 10, 20, 30…

Question 17

Frequency

Answer 17

how often it occurs

Question 18

GROUPED FREQUENCY TABLES:

Answer 18

• Groups are called “class intervals”.
• Make sure there’s no overlap with classes, and no gaps.
• The “class centre” is the middle value of each class.

Question 19

Cumulative Frequency

Answer 19

The running total of frequencies.
Always start with the first frequency, then add the next frequency to get the next cumulative frequency.

Question 20

histogram

Answer 20

A histogram is a column graph

Question 21

polygon

Answer 21

A polygon is a line graph