Match the definition with the terms.
1. a portion of a large group
2. choosing a sample so that every member has an equal chance of being chosen
3. choosing a sample from people who are under 15 years old
4. using the responses of a small group to make conclusions about the large group.
random sample
sample
biased sample
estimating from a sample

Random sample - choosing a sample so that every member has an equal chance of being chosen (this is the absolute definition of random sampling)

Sample - a portion of a large group is termed as a sample.

Biased sample -  choosing a sample from people who are under 15 years old (biased sampling states that all the members of a group are not included in survey)  

Estimating from a sample - using the responses of a small group to make conclusions about the large group.(estimation means roughly judging something based on some sample )

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: