It's important to identify potential sources of bias when planning a sample survey.
When we say there's potential bias, we should also be able to argue if the results will probably be an overestimate or an underestimate.
Try to identify the source of bias in each scenario, and speculate on the direction of the bias (overestimate or underestimate).
Scenario 1

David hosts a podcast and he is curious how much his listeners like his show. He decides to start with an online poll. He asks his listeners to visit his website and participate in the poll.
The poll shows that
89%, percent of the 200 respondents "love" his show.
QUESTION A
What is the most concerning source of bias in this scenario?

Choose 1

(Choice A)
A
Response bias

(Choice B)
B
Undercoverage

(Choice C)
C
Voluntary response sampling

The avenues in a particular city run north to south and are numbered consecutively with 1st avenue at the western border of the city. the streets in the city run east to west and are numbered consecutively with 1st street at the southern border of the city. for a festival, the city is not allowing cars to park in a rectangular region bordered by 5th avenue to the west. 9th avenue to the east, 4th street to the south, and 6th street to the north. if x is the avenue number and yis the street number, which of the following systems describes the region in which cars are not allowed to park? 5th ave 9th ave

Which exponential function has an initial value of 2? f(x) = 2(3x) f(x) = 3(2x)

Acaterer knows he will need 60, 50, 80, 40 and 50 dinner napkins on five successive evenings. he can purchase new napkins initially at 25 cents each, after which he can have dirty napkins laundered by a fast one-day laundry service (i.e., dirty napkins given at the end of the day will be ready for use the following day) at 15 cents each, or by a slow two-day service at 8 cents each or both. the caterer wants to know how many napkins he should purchase initially and how many dirty napkins should be laundered by fast and slow service on each of the days in order to minimize his total costs. formulate the caterer’s problem as a linear program as follows (you must state any assumptions you make): a. define all variables clearly. how many are there? b. write out the constraints that must be satisfied, briefly explaining each. (do not simplify.) write out the objective function to be minimized. (do not simplify.)