Question

1. taking a poll

to be sure that a poll is accurate and representative of the general population
____, the following have to be done:
define the population ____ to be polled
construct a _sample ____.

• chosen by chance
• representative number from subgroups

prepare a valid survey - must be unbiased

Explanation:

The problem is about taking a poll (survey) and ensuring its accuracy. Key steps for an accurate poll include: first, defining the population (the group to be polled, e.g., all voters, all students). Then, constructing a random sample (chosen by chance, representative of subgroups) to avoid bias. Finally, preparing a valid survey that is not biased. So the blanks likely fill as: "First", "population", "random", "sample", "random", "sample" (with the bullet points describing random sampling: chosen by chance, representative number from subgroups), and the last part about preparing a valid survey (not biased).

Answer:

• First, the following have to be done:
• Define the population to be polled
• Construct a random sample
• chosen by chance
• representative number from subgroups
• Prepare a valid survey (must be unbiased)

(Note: Filled based on principles of survey design and sampling in statistics/polling methodology, where defining the target population, using random sampling for representativeness, and unbiased surveys ensure poll accuracy.)