Question

a dentist wants to find out how often her patients floss their teeth. which samples are biased? check all that apply.
o all her patients
o patients with no cavities
o patients younger than 18
o every 20th patient
o every patient with braces

Explanation:

• Patients with no cavities: These patients likely have good oral hygiene (including flossing), so only sampling them would over - represent flossers.
• Patients younger than 18: Younger patients may have parents or guardians influencing their oral care (including flossing habits), and they may not be representative of all patients.
• Every patient with braces: Braces wearers may have more specific oral care instructions (including flossing) that are not typical for all patients.

Answer:

• Patients with no cavities
• Patients younger than 18
• Every patient with braces