S3 June 2005 Q1
1.
(a) State two reasons why stratified sampling might be chosen as a method of sampling when carrying out a statistical survey. (2)
(b) State one advantage and one disadvantage of quota sampling. (2)
| Scheme | Marks |
|---|---|
| Population divided into mutually exclusive; groups (distinct) (strata) | B1; B1 |
| (2) |
| Scheme | Marks |
|---|---|
| Advantages – enables fieldwork to be done quickly – costs kept to a minimum – administration is relatively easy Any ONE | B1 |
| Disadvantages – non-random so not possible to estimate sampling errors – subject to possible interviewer bias – non-response not recorded Any ONE | B1 |
| (2) | |
| (4 marks) |