1. A Murdoch University agricultural researcher is investigating dermatitis in sheep and wants to obtain a reliable indication of the prevalence. Sheep in the region are held on 213 properties of varying size, which have a range of soil and vegetation types. The distribution of the number of sheep per property is positively skewed (some big flocks, but most are smaller). All assessments are to be made on the home farms by the researcher or an assistant. Funds are available to assess skin conditions on about 360 sheep.
   • Randomly select 45 properties by means of computer-generated random numbers.

The assistant has suggested the following sampling method:

• The number of sheep assessed on each selected property will be in proportion to the numberof sheep on the property so that the total sample size is 360.
• On each property, select every k^thanimal for assessment as it goes through the drenching chute, where kis chosen to give the correct sample size for the property.

For the suggested sampling method:

1. Identify any elements of simple random sampling, convenience sampling, cluster sampling,systematic sampling, or stratified sampling. [3]

Brieflyassess how well the method will meet the researcher's objective.