Sampling ; Large Data Set

Question 1

What is a population

Answer 1

Population is any set of things we want to study

Question 2

What is a census

Answer 2

A census is when we want to collect data of every member or thing in a population

Question 3

What is a sample

Answer 3

Any subset of a population

Question 4

What are inferences

Answer 4

Inferences is when you use data from a sample to make estimates

Question 5

What is opportunity sampling and give a +ve and -ve

Answer 5

Opportunity sampling means choosing respondents based on their availability and convenience
+ve cheap and convenient
-ve may not be generalisable

Question 6

What is simple random sampling and give a +ve and -ve

Answer 6

In simple random sampling every possible sample has an equal chance of being selected
+ve produces an unbiased sample
-ve hard to doin practice

Question 7

What is systematic sampling and give a +ve and -ve

Answer 7

Systematic sampling means taking participants at regular intervals from a list of the population
+ve avoids unwanted clustering of data
-ve requires a list of the entire population

Question 8

What is stratified sampling and give a +ve and -ve

Answer 8

Stratified sampling means splitting the population into groups based on factors relevant to research, then opportunity sampling from there
+ve Produces a sample representative over the factors identified
-ve time consuming and expensive

Question 9

What is quota sampling and give a +ve and -ve

Answer 9

Quota sampling means splitting the population into groups based on factors relevant to the research then opportunity sampling from there
+ve ensures the sample is representative over the factors identified
-ve may not be generalisable

Question 10

What is cluster sampling and give a +ve and -ve

Answer 10

Cluster sampling means splitting the population into groups based on convenience
+ve cheap and easier than other random methods
-ve less accurate than other random methods

Question 11

What are the pros and cons of a census

Answer 11

Pro: data for every member of the population
Con: time consuming and expensive and may be destructive

Question 12

What are the nine body types in the lds

Answer 12

1,2,3,4,5,6,13,14,96

Question 13

Where is the data in the lds from

Answer 13

London
South west
North west

Question 14

What is the engine size measured in

Answer 14

Cm^3

Question 15

How many cars in the lds

Answer 15

92

Question 16

Explain the emission rate of Carbon dioxide

Answer 16

Carbon dioxide emissions are recorded for 83% of cars
For most cars this means 173g/km is used per km of travel

Question 17

What percentage of cars are diesel

Answer 17

In the department of transport the original data set, 24% of cars are diesel
This means they likely have particulate data for 24% of cars

Question 18

What are the propulsion types

Answer 18

1 petrol
2 diesel
3 electric
Combined fuel types:
7 gas/petrol
8 electric/petrol

Question 19

What does gas/petrol refer to

Answer 19

Gas petrol refers to a car which takes petrol but can also take liquid petroleum gas

Question 20

How do code 1 and 7 differ

Answer 20

There is only one car in the LDS with propulsion type 7

Question 21

What does electric/petrol refer to

Answer 21

Electric/petrol refers to a car which takes petrol but also runs partly on electricity
All of the cars with this propulsion type were registered in 2016