sampling

Question 1

advantages of simple random sampling

Answer 1

free of bias
cheap and easy for small
equal chance

Question 2

disadvantages of simple random sampling

Answer 2

not suitable for large sets
sampling frame needed

Question 3

advantages of census

Answer 3

completely accurate

Question 4

disadvantages of census

Answer 4

expensive
time consuming lots of data
difficult to ensure whole population

Question 5

advantages of a sample

Answer 5

less time consuming
fewer people than census
less data

Question 6

disadvantages of sample

Answer 6

not accurate
may bot be large enough to represent population

Question 7

advantages of systematic sampling

Answer 7

simple and quick
suitable for large sets

Question 8

disadvantages of systematic sampling

Answer 8

sampling frame
introduce bias if it’s not random

Question 9

advantages of stratified sampling

Answer 9

accurately refelects population structure
proportional representation of groups

Question 10

disadvantages of stratified sampling

Answer 10

population clearly classified into distinct strata
selection within stratum suffers from disadvantages as simple random

Question 11

advantages of quota sampling

Answer 11

small sample represent
no sampling frame
quick and easy
easy comparison

Question 12

disadvantages of quota

Answer 12

introduce bias
must be divided into groups
increasing scope of study and expense
non responses nokt recorded

Question 13

advantages of opportunistic sampling

Answer 13

easy to carry out
inexpensive

Question 14

disadvantages of opportunity sampling

Answer 14

unlikely to be provided representitivelt
dependant on researcher

Question 15

advantages of random

Answer 15

no bias
clear on method

Question 16

advantages of non random

Answer 16

useful when no sampling frame
useful if it’s difficult to reach

Question 17

disadvantages of random sampling

Answer 17

might not want to take part
sampling frame

Question 18

disadvantages of no. random

Answer 18

samples likely to be unrepresentative
researcher may be swayed

Question 19

what is continuous data

Answer 19

has to be measured and can take a value between any two points

Question 20

what is discrete data

Answer 20

if values are distinct and separate - counted

Question 21

how do you cleanse data

Answer 21

Q3+k(Q3-Q1)

Question 22

where is AnB

Answer 22

in the middle of the venn

Question 23

What are the 5 weather stations in the UK

Answer 23

Leuchars
Leeming
Camborne
Hurn
Heathrow

Question 24

Where is leuchars

Answer 24

Scotland

Question 25

Where is leeming

Answer 25

North yorkshure

Question 26

Where is Heathrow

Answer 26

Near London

Question 27

Where is hurn

Answer 27

Bournemouth

Question 28

Where his Camborne

Answer 28

Cornwall

Question 29

Where are the oversea weather statins

Answer 29

Jacksonville
Beijing
Perth

Question 30

Where is Jacksonville

Answer 30

SE coat US

Question 31

What variables are recorded

Answer 31

Daily maximum temp (C)
Daily total rainfall (mm)
Daily total sunshine daily maximum relative humidity (%)
Daily mean wind speed (knots)
Daily maximum gust
Wind direction and gust (bearing)
Visibility (dm décamètres)
Pressure (hPa)

Question 32

What is the Beaufort scale

Answer 32

Discrete scale of 13 values 0-12
Wind speed and gust
0=calm
12=64knots

Question 33

What are okras

Answer 33

Eights of the sky covered by cloud
0-8
Discrete scale

Question 34

What does tr mean in data set

Answer 34

Trace amounts eg >0.05mm

Question 35

What happened in 1987

Answer 35

Great storm UK -October
hurricane floyd USA October