Consider the following two study designs: In a water pollution study, water samp
ID: 3126549 • Letter: C
Question
Consider the following two study designs: In a water pollution study, water samples were collected from a stream on 15 rainy days and 15 non-rainy days. To study the size (diameter) distribution of scrub oaks (shrubby oak trees), 20 oak trees were selected by using random latitude/longitude coordinates. If the random coordinate fell within the canopy of a tree, the tree was selected; if not, another random location was generated. Which study is collecting a better random sample from the population of interest (and therefore has less unwanted bias) and why?Explanation / Answer
The second study has a better random sample as in the first study sample from only a single stream is collected. It's values cannot be generalized to the water pollution for the entire population as the water in some other stream might be more polluted or much less polluted.
Whereas in the second study the sample takes in to account various locations thus giving us a better random sample