Chapter 3 Flashcards
1
Q
parameter
A
a number that describes the population; it is a fixed number but we don’t know the value
2
Q
statistic
A
a number that describes the sample; can change from sample to sample, and used to estimate the parameter
3
Q
bias
A
systematic over or underestimate of the population parameter
4
Q
Variability
A
describes how spread out the values of the sample statistic are when we take many samples
5
Q
to reduce bias
A
use random sampling
6
Q
to reduce variability
A
use larger sample
7
Q
Margin of Error (MOE)
A
plus or minus 4% points of the truth about the population
1/>/”n”
says how close the sample statistic lies to the population parameter
8
Q
Level of confidence
A
says what percentage of all possible samples satisfy the MOE
9
Q
Confidence Statement
A
sentence including the MOE and level of confidence
