Applied Chap 1

Question 1

1 adv and 1 dis of a census

Answer 1

Should give completely accurate results
Cannot be used when test involved destruction

Question 2

1 adv and 1 dis of a sample

Answer 2

Less time consuming
Sample may not be large enough to represent small sub-groups of population

Question 3

1 adv and 1 dis of simple random

Answer 3

Each unit has an equal chance of being chosen
May not accurately reflect population

Question 4

1 adv and 1 dis of systematic

Answer 4

Suitable for large samples and populations
Sample frame is needed

Question 5

Stratified sampling

Answer 5

Divided into groups and a simple random sample is carried out in each group.

Question 6

1 adv and 1 dis of stratified

Answer 6

Accurately reflects population
Sampling frame is needed

Question 7

Quota sampling

Answer 7

Divided into groups based of characteristic. Reflects group proportion in population (same as stratified but not random). Once quota is full, ignore subsequent units that also meet the characteristic

Question 8

1 adv and 1 dis of quota

Answer 8

No sampling frame required
Can depend on knowledge/expertise of researcher

Question 9

1 adv and 1 dis of opportunity

Answer 9

Easy to carry out
Unlikely to provide representative sample

Question 10

Quantitive

Answer 10

Numerical values. Discrete is you can count it. Continuous is you measure it

Question 11

Qualitative

Answer 11

Non-numerical values like colour

Question 12

LDS tips

Answer 12

‘tr’ trace means rainfall less than 0.05mm so use 0.025 in calculations
Wind speed measure in knots and Beaufort Scale
1Dm (decametre) is 10m
Pressure in hectopascals (hPa)= 100Pascals
Oktas is 1/8s of sky covered, 0-8, 9 values