1. An entomologist, a scientist who studies insects, is conducting a sample of the mountain pine beetle in
the Black Hills National Forest. This native insect is detrimental to the ponderosa pine trees. The
forest has been mapped into 10 mile square sections. The entomologist will randomly select 20
sections and count the number of beetle infected trees in each section. Which of the following
statements is true?
(A) This is a convenience sample because the sample of trees was easily obtained.
(B) This is a stratified random sample because trees were randomly selected from each section.
(C) This is a cluster sample because sampled trees were from randomly selected sections.
(D) This is a simple random sample of the trees from the forest using sections.
(E) It is a systematic sample because every 10th section was sampled