three hundred people participated in a free 1...
three hundred people participated in a free 12 - week weight - loss course at a community health clinic. after one year, administrators emailed each of the 300 participants to see how much weight they had lost since the end of the course. only 56 participants responded to the survey. the mean weight loss for this sample was 13.6 pounds. which is the main source of bias? nonresponse bias undercoverage response bias
Answer
# Brief Explanations:
Only 56 out of 300 participants responded to the survey. Non - response bias occurs when individuals selected for a sample do not respond, potentially leading to a non - representative sample. Here, those who responded may have different weight - loss experiences than those who did not, creating bias.
# Answer:
Nonresponse