S3 June 2013 (R) Q1
1. A gym club has 400 members of which 300 are males.
Explain clearly how a stratified sample of size 60 could be taken. (3)
| Scheme | Marks |
|---|---|
| Label females 1 – 100 (or 0 – 99) and males 1 – 300 (or 0 – 299) | B1 |
| Using random numbers for each group | B1 |
| in range 1 – 100 (0 – 99) select 15 females and using 1 – 300 (or 0 – 299) select 45 males | B1 |
| (3 marks) |
Notes
1st B1 for labelling/numbering/listing females and males
2nd B1 for use of random numbers or “randomly select” in each group (may be implied)
3rd B1 for selecting the correct number of females and males
e.g. randomly select 45 males and 15 females scores 2nd and 3rd B marks since randomly selecting and the “each group” is implied,
If using systematic sampling within each strata allow 1st B1 and 3rd B1 (if earned) but 2nd B0