SWBAT: Identify and select a Simple Random Sample (SRS)
Lesson 4-2
Do Now:
​
​
​
​
​
​
​
​
​
​
​
Simple Random Sample ​
A sample in which individuals have equal chance of being selected.
**An SRS not only gives each individual an equal chance to be chosen but also gives every
possible sample an equal chance to be chosen.​
**Doesn’t favor any part of the population ​
Ways to produce an SRS: ​
a) Pull names out of a hat ​
b) Random number generator (calculator) ​
c) Table of Random digit ​
Table of Random Digits ​
1: Label.​ Give each member of the
population a numerical label of the
same length. ​
​
​
​
​
​
​
​
​
​
​
​
​
​
​
​
​
​
​
​
​
2: Table.​ Read consecutive groups of ​
digits of the appropriate length from ​
Table D. Your sample contains the individuals ​
whose labels you find. ​
​
​
Calculator ​
​
MATH ​
Prob ​
Randint( ​
SWBAT: Identify and select a Simple Random Sample (SRS)
Lesson 4-2
Example:​ There is a big teacher’s convention coming up and White Plains HS wants to send 5 of
its teachers to represent the school. There were 18 teachers who want to go, but only 5 will ​
make the cut. Use line 112 to randomly select the 5 teachers to go to the convention. The 18 ​
teachers are listed below: ​
Lee
​
Levine ​
​
Joseph ​
​
Hertel ​
​
​
C ortino ​
​
​
Johnson ​
​
Roma ​
​
Davis ​
​
​
Spicconardi ​
​
​
Spatola ​
​
​
​
Marchetti
​
​
Phillips ​
​
​
Lambert
​
Williams
​
Diaz
​
​
​
Sibrizzi
​
​
Butini ​
​
​
​
Stanton