A212­5Notes.notebook
September 21, 2010
Algebra 2
Ch.12 Notes Page 26
P26 12­5 Working with Samples
Aug 19­6:20 AM
Samples
Sample ­ Part of a Population
Sample Proportion ­ Ratio of x/n
x is the number of times an event occurs in a sample size of n
Random Sample ­ All members of a population are equally likely to be chosen.
Sampling Bias ­
When data is influenced in a way that it no longer represents the entire population
Sep 6­8:02 AM
1
A212­5Notes.notebook
September 21, 2010
Sampling Bias
Sep 26­8:25 AM
Margin of Error
Margin of Error estimates how accurate a number is considered to be from a given population.
Based on Standard Deviation.
The larger the sample, the smaller the Margin of Error
n = sample size
Margin of Error = (+/­) 1
n
Estimate the Sample Size if the Margin of Error is +/­ 4%
Sep 22­9:02 AM
2
A212­5Notes.notebook
September 21, 2010
.02 = 1/ n
=2,500
Sep 26­8:31 AM
HW #21
12­4
12­5
P672 #1,2,4,5,8,15,21
P680 #1,2,4,5,8­10,12,13,16,18,20,32
Please put your name and class period at the top of the homework. Also include the homework number.
Feb 2­2:01 PM
3