Week 3-4

Question 1

Write the equations for,

1) Population mean
2) Population variance
3) Sample mean
4) Sample variance

Answer 1

Check 3.1

Question 2

What is a representative sample?

Answer 2

A sample that is chosen from a population according to a set of characteristics

Question 3

List 3 characteristics that can reduce the sampling bias of a sample

Answer 3

1) A representative sample
2) Randomly chosen individuals
3) A sufficiently large sample size

Question 4

List the 4 types of sampling

Answer 4

1) Unordered without replacement
2) Ordered without replacement
3) Unordered with replacement
4) Ordered with replacement

Question 5

If you want to select a sample size of 2, without replacement and unordered, from a population of 3, how many distinct samples can be selected?

Answer 5

3

check 4.2