QUESTION 1 A dentist wants to conduct a survey via telephone to determine what percent of all adults in their city floss daily. Which of these is the best example of selection bias? Some people might not answer their phone after repeated calls. People with unlisted phone numbers or people with cell phones might be left out the sample, and their flossing habits may be different than those in the sample. Some people might refuse to tell a stranger on the phone about their flossing habits. Some people might feel pressured to say they floss daily even though they don't. QUESTION 2 A dentist wants to conduct a survey via telephone to determine what percent of all adults in their city floss daily. Which of these is the best example of response bias? Some people might not answer their phone after repeated calls. People with unlisted phone numbers or people with cell phones might be left out the sample, and their flossing habits may be different than those in the sample. Some people might refuse to tell a stranger on the phone about their flossing habits. Some people might feel pressured to say they floss daily even though they don't. QUESTION 3 What is one of the distinctions between a population parameter and a sample statistic? A population parameter is only based on conceptual measurements, but a sample statistic is based on a combination of real and conceptual measurements. A sample statistic changes each time you try to measure it, but a population parameter remains fixed. A population parameter changes each time you try to measure it, but a sample statistic remains fixed across samples. The true value of a sample statistic can never be known but the true value of a population parameter can be known.