1. MORE ON POPULATION & SAMPLE

2. Objective To distinguish between a sample and a population Purpose/Relevance To understand how a statistical study using a sample can be used to describe a population

3. PRETEST

4. POPULATION The entire collection of individuals about which information is desired.

5. SAMPLE Subset of the population from which we actually collect the information. Used to draw conclusions about the population Population Sample Collect data from a representative Sample... Make an Inference about the Population.

6. GIVE THE POPULATION & SAMPLE. Favorite class of all T. L. Hanna students. Survey people to find out who they will vote for. Test the strength of ropes – 1 per hour.

7. A COMPANY EMPLOYS 800 INDIVIDUALS. TO DETERMINE HOW THE EMPLOYEES FEEL ABOUT THE NEW INSURANCE PLAN, 80 OF THE EMPLOYEES ARE SURVEYED. *Describe the population: *Describe the sample:

8. WE WANT TO DETERMINE THE PERCENTAGE OF SOUTH CAROLINA VOTERS WHO WILL VOTE FOR HILARY CLINTON IN THE NEXT ELECTION IF THE ELECTION TOOK PLACE TODAY. *Describe the population: *Describe the sample:

9. IDENTIFY THE POPULATION & THE SAMPLE: A furniture maker buys hardwood in large batches. The supplier is supposed to dry the wood before shipping (to keep it’s size and shape). The furniture maker chooses five pieces of wood from each batch and tests their moisture content. If any piece exceeds 12% moisture content, the entire batch is sent back.

10. IDENTIFY THE POPULATION & THE SAMPLE: Each week, the Gallup Poll questions a sample of about 1500 adult U. S. residents to determine national opinion on a wide variety of issues.

11. DESCRIBE THE POPULATION & SAMPLE. A consumer group conducts crash tests of new model cars. To determine the severity of damage to 2003 Mazda 626’s resulting from a 10-mph crash into a concrete wall, the research group tests six cars of this type and assesses the amount of damage.

12. FISH TAG LAB

13. HOMEWORK *Worksheet – Population & Sample