a dentist wants to find out how often her pat...
a dentist wants to find out how often her patients floss their teeth. which samples are biased? check all that apply. all her patients patients with no cavities patients younger than 18 every 20th patient every patient with braces
Answer
# Answer:
B. patients with no cavities, C. patients younger than 18, E. every patient with braces
# Brief Explanations:
Samples of patients with no cavities may floss more regularly; younger patients may have different flossing habits; patients with braces may have different oral - care routines compared to all patients. These samples do not represent all patients and are thus biased. Every 20th patient is a form of systematic sampling which can be unbiased if done properly, and all her patients is the entire population (not a biased sample).