Random Sampling

Question 1

What is random sampling

Answer 1

Chooses items at random and gives every item in a population equal chances of being chosen

Question 2

What do you need in order to do random sampling

Answer 2

A full list of the population so everyone has a chance to be included

Question 3

Pros of random sampling

Answer 3

Every member of the population has a equal chance of being selected so it is completely unbiased and should represent the whole population

Question 4

Cons of random sampling

Answer 4

No always practical or convenient - population could be spread over large area, so may have to travel lots
It might be impossible to list the whole population or to access everyoen

Question 5

What is simple random sampling

Answer 5

A method for choosing a random sample

Question 6

When is it easiest to use simple random sampling

Answer 6

When you have a small, well defined population

Question 7

How to do simple random sampling

Answer 7

1)Assign a number to every member of a sample frame
2)Use a computer, calculator, random number table/list, dice or cards to create a list of random numbers
3)Match the numbers to the members in the sample frame to create a sample of people