Data And Sampling

Question 1

What is raw data?

Answer 1

Data that is collected before it is ordered, grouped or rounded

Question 2

What is quantitative data?

Answer 2

Data measured in an amount eg an amount

Question 3

What is qualitative data?

Answer 3

Data that is not measured

Question 4

What is an example of qualitative and quantitative data?

Answer 4

Qualitative- Description of the weather
Quantitative- time in 100m

Question 5

What are the 2 types of quantitative data?

Answer 5

Discrete and continuous

Question 6

What is discrete data?

Answer 6

Data that can only take particular values on a numerical scale

Question 7

What is continuous data?

Answer 7

Data that can take value on a continuous numerical scale

Question 8

What is an example of discrete and continuous data?

Answer 8

Discrete- shoe size
Continuous- foot length

Question 9

What can categorical data be sorted into?

Answer 9

Non-overlapping categories

Question 10

If a number is missing and you know the mean of the numbers, how do you find the missing value?

Answer 10

(Number of numbers X mean) - each number= missing value

Question 11

What is ordinal data?

Answer 11

Data that can be written in order or given a numerical rating scale

Question 12

What is bivariate data?

Answer 12

Data that involves pairs of related data

Question 13

What is multivariate data?

Answer 13

Data that involves sets of 3 or more related data values

Question 14

How can discrete data be organised?

Answer 14

Classes that do not overlap

Question 15

How should grouped continuous data be classed?

Answer 15

By using intervals that include all possible values and don’t have gaps in between them

Question 16

When the minimum or maximum possible value isnt known, what type of interval can be used?

Answer 16

An open-ended class interval

Question 17

What is primary data?

Answer 17

Data you collect or someone collects for you

Question 18

What is secondary data?

Answer 18

Data collected by someone else

Question 19

What is a population?

Answer 19

Everything or everybody that could possibly be involved in a statistical investigation

Question 20

What is a census?

Answer 20

A survey or investigation with data taken from every member of a population?

Question 21

What is a sample?

Answer 21

A part of a population that contains information about a part of a population

Question 22

What is a sampling unit?

Answer 22

The people or items that are to be sampled

Question 23

What is a sampling frame?

Answer 23

Is a list of all sampling units

Question 24

What is the capture- recapture formula?

Answer 24

Entire population= (origanol capture size X recaptured size) divided by number marked in recaptured sample

Question 25

What is random sampling?

Answer 25

Every me never of the population has an equal chance of being chosen

Question 26

What is judgement sampling?

Answer 26

Use your judgement to select a sample that is representative

Question 27

What is opportunity sampling?

Answer 27

Use the people or objects that are available at the time

Question 28

What is cluster sampling?

Answer 28

Used when the data natrualy splits into groups

Question 29

What is systematic sampling?

Answer 29

Choose a starting point and then choose items at a regular interval

Question 30

What is quota sampling?

Answer 30

Group the population by characteristics and use a pre-determined number from each group

Question 31

What is stratified sampling?

Answer 31

Sample is in proportions as the origanal data

Question 32

What is the stratified sampling equation?

Answer 32

(Group divided by population) X sample size