A researcher wants to study invasive plant species on an acre of land to determi

Question

A researcher wants to study invasive plant species on an acre of land to determine the proportion of plant species that are invasive. Invasive species" means a non-native species whose introduction has caused, or is likely to cause, economic or environmental harm harm to human health. An acre is any perimeter enclosing 43,560 square feet. The acre will be divided into 1 square foot plots. The potential invasive plant species are expected to reproduce from a starting point and extend out from that point each year The researcher has a list of invasive species and will sample 25 square feet in the selected acre by counting the total number of plants and the number of invasive plant species in each square foot plot in the sample. Which sampling method would be best: a simple random sample, a stratified sample, or a systematic sample? Explain.

Explanation / Answer

Ans:

The best sampling method will be stratified sampling,as sampled population of invasive plants is divided into different parts(strata) of 1 sq. feet.

Stratified sampling refers to a type of sampling method . With stratified sampling, the researcher divides the population into separate groups, called strata. Then, a probability sample (often a simple random sample ) is drawn from each group.

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