sampling

Question 1

what does it mean when a population has validity?

Answer 1

the results generalise to other people.

Question 2

the more a sample looks like the original population…..

Answer 2

the more representative we say it is

Question 3

when it is impossible for a researcher to test everyone in the population what do they do?

Answer 3

so they pick a sample

Question 4

what is a better sample

Answer 4

representative of the population

Question 5

what are the five types of sampling?

Answer 5

volunteer sampling 
opportunity sampling 
systematic sampling 
random sampling 
stratified sampling

Question 6

what is sampling?

Answer 6

when researchers pick a sample of the population

Question 7

what is volunteer sampling

Answer 7

when the researcher posts an advertisement and people apply to be participants in the study

Question 8

advantage of volunteer sampling?

Answer 8

it is easy and can reach lots of people

Question 9

what is the limitation of volunteer sampling ?

Answer 9

the sample will not be very representative of the population

Question 10

what is opportunity sampling?

Answer 10

when a researcher approaches members of the population who are willing and available to be participants

Question 11

what is an advantage of opportunity sampling?

Answer 11

it is a quick and easy way to sample participants

Question 12

what is a limitation of opportunity sampling?

Answer 12

the sample won’t be representative of the population

Question 13

why is volunteer sampling easy?

Answer 13

because all you have to do is put an ad up and wait

Question 14

why is opportunity sampling easy?

Answer 14

because all you have to do is go and talk to people

Question 15

why is volunteer sampling unrepresentative?

Answer 15

only certain types of people will volunteer

Question 16

why is opportunity sampling unrepresentative?

Answer 16

only get participants who are willing and available at the time

Question 17

why might opportunity sampling lead to an unrepresentative sample

Answer 17

No matter where or when you do opportunity sampling, some members of the population are more likely to be there and more likely to be willing and available.

Question 18

what is a better sample?

Answer 18

representative of the whole population

Question 19

what is systematic sampling ?

Answer 19

when researcher’s pick every nth person from the entire population

Question 20

what is an advantage of systematic sampling?

Answer 20

that it will often lead to a more representative sample than volunteer or opportunity sampling. this is because it involves sampling from the entire or whole population

Question 21

what is an limitation of systematic sampling?

Answer 21

it is difficult because the researcher has to obtain a list of the whole population
a second con is that there is a pattern in how the data is listed, the sample may not be representative of the whole population

Question 22

what is random sampling?

Answer 22

picking randomly from a list of the entire population, so that everyone has a equal chance of being a participant

Question 23

what is an advantage of random sampling ?

Answer 23

representative because every member of the population has an equal chance of being included

Question 24

what is a limitation of random sampling

Answer 24

it is more difficult because you need a list and and a way to randomise it
it still doesn’t guarantee that the sample will look like the population