Stats

Question 1

What is a census?

Answer 1

= observes or measures every member of a population

Question 2

What is a sample?

Answer 2

= selection of observations taken from a subset of a population, to find imfornatopm as a whole

Question 3

Advantages and disadvantages of a census?

Answer 3

AD: accurate
DV: time consuming, expensive, hard to process large amount of datae

Question 4

advantages and disadvantages of a sample?

Answer 4

AD: less time consuming, and less expensive, fewer people have to repsond

DV:
= not be accurtae, may not be larhe aboughb to gibe the impression of a whole population

Question 5

What is a sampling frame?

Answer 5

= a list of items

Question 6

What are sampling units?

Answer 6

= indovidual units of a population

Question 7

What is random sampling?

Answer 7

= where every unit in the sample has an equal chance of being selected
e.g: random number generator, lottery sampling

Question 8

What is systematic sampling?

Answer 8

= the required elements are chosen at regular intervals from an ordered list

Question 9

What is stratified samplig?

Answer 9

= population is divided and a random sample is takenf rom eahc

= number in stratnum/ number in piopulation x oversall sample size

Question 10

What are the advantages and disadvantages of random sampling?

Answer 10

A:
= free of bias
= easy and cheap
= equal chance of selection for every unit
D:
= not suitable when the population size is large- time consuming, expensive
= sampling frame is needed (list of units)

Question 11

What are the advantages and disadvantages of systematic sampling?

Answer 11

A:
= simple and quick to use
= suitable for large samples
D:
= sample frame is needed
= introduce bias if sample frame is not random

Question 12

What are the advantages and disadvantages of stratified sampling?

Answer 12

= A:
= reflects the population structure
= representation of the population
D:
= population must be classified
= same disadvantages as simple random samploing

Question 13

What is quota sampling?

Answer 13

= interviewer or reasearcher selects a sample that reflects the characteristics of the whole population

Question 14

What are the advantages and disadvantages?

Answer 14

= no sampling frame needed
= quick easy and inexpensive
= allows comparison
= could be biased, population must be divided into groups, non-responses are not recorded

Question 15

What is oppurtinitisyic samplng?

Answer 15

= taking the sample from people who are avaliable at the time carried out and fit criteria

Question 16

What are the advantages and disadvantages?

Answer 16

= easy to carry out
= inexpensive

= dependant on the individual