|random sample||stratified random sample|
|Advantages||a.The use of random sample eliminates biases in the researcher's choice of subjects.
b. Each subject must have an equal chance of being delected so that any biases of the researcher are obviated.
|a.The researcher can randomly select from each of the different groups, or strata, in proportion to their occurrence in the population.
b. This procedure also requires random selection but adds a certain amount of precision to the representativeness of the samplee and allows for the use of the identified characteristics as varaibles.
|Disadvantages||For a heterogeneous group, purely random sampling might not representatively sample each level or subgroup within the population, particularly when the samples to be usedd are small of the groups to be formed are of unequal sizes.||For a homogeneouss group, purely sampling is much easier to do than stratified sampling.|
What is an adeuate sample size?There is no quick and easy answer to this question, but there is little doubt that the large the sample, the better.
Introduction: They explain why they want to proceed this experiment.Because they find the condition of grinding sample will affect the result in archaeological experiment. In this part, they also cite many literature about archaeological experiments to help explain what the preparation of sampling is the major consern today.
Method: They proceed three experiments and give method, results and discussion in every experiment part. They mentioned what material they used (a small compact bone fragment od Middle Paleolithic age from Hayonim Cave was ground into a homogeneous powder wuth agate mortar and pestle.)
Conclusion: They analyze the three results of each experiments in the conclusion parts. Giving their conclusions in the list.
Future Research: They have an part like "Future Research" which called "Proposed Sample Preparation Method and Standards". They propose some method to help archaeologist can get some replicable results, independent of sample preparer, and with relatively low and consistent levels of error.
Acknowledgement: They put their acknowledge in the final part to thank some people who help them.
Reference:They also list the references they used in this article.