(i) The type of sampling when a population is first divided into subgroups and then a sample is selected from each subgroup is called stratified random sampling.
(ii) Auditors may select every 20th file starting with say, the 5th file in the top drawer. Then file numbers 25, 45, 65, 85, are audited. This type of sampling is called systematic sampling.
(iii) The mean of a population is called a parameter.

Select one:

a. (i) and (ii) are correct statements but not (iii).

b. (i), (ii), and (iii) are all correct statements.

c. (i) and (iii) are correct statements but not (ii).

d. (i), (ii), and (iii) are all false statements.

e. (ii) and (iii) are correct statements but not (i).