(b) The Gallup Poll asks respondents how they would rate the honesty and ethical standards of people in different fields. In 2005, only 8% of the respondents gave car salesman a rating of “very high or high”, while 7% of the same respondents rated telemarketers as “very high or high”. The difference between 8% and 7% is due to sampling variability.
I say False, because sampling variability is when variability is a result due to the usage of different samples and or sample sizes. However, in this poll the same respondents are used to ask two different questions rather than it being different samples of people. Therefore, respondent bias may be a potential factor which affects the differences between these percentages. But I am not sure with this answer?