1. Statistics – Chapter 1 Data Collection
1.1 Introduction to the Practice of Statistics

2. Draw a conclusion or make a decision
Vocabulary
collecting
Statistics is the science of _____________, ____________, ________________, and ____________ information to draw conclusions or answer questions.
Data are facts or propositions used to ____________________________________
organizing
summarizing
analyzing
Draw a conclusion or make a decision

3. Draw a conclusion or make a decision
Data are facts or propositions used to ____________________________________
Data can be numerical or non-numerical (gender)
Data are extremely powerful and can be dangerous when misused
Radio Show Example
The lurking variable is a third variable that influences the other 2 variables in question.
Breast feeding and IQ level
Lurking variable =
Draw a conclusion or make a decision
mothers who breast fed tended to have higher IQ scores, so genetics is the lurking variable

4. The Statistical Process
1. Identify the research objective
Identify the question(s) to be answered and the group to be studied
Population : ______________________________
Individual: ________________________________
The group to be studied
Member of the population being studied

5. The Statistical Process
2. Collect the information needed to answer the question.
Sample : _______________________________
It is nearly impossible to obtain data from an entire population
How you collect the information can greatly change the results of the data collected
subset of the population

6. The Statistical Process
3. Organize and summarize the information
This step is called ________________________
Describes information collected through numerical measurements, charts, graphs, and tables
This step of the process is where most of the math happens!
Descriptive statistics

7. The Statistical Process
4. Draw conclusions from the information
The information collected from the sample is ____________________________________
Inferential Statistics uses methods that takes results obtained from a sample, extends them to populations, and measures reliability of the result.
Generalized to the entire population

8. Innocuous drug – sugar pill Receive the drug that is being tested
Example 1 – Our 1st Study
Innocuous drug – sugar pill
Placebo: _______________________________
Experimental Group: _____________________
Control Group: _________________________
Double Blind: ___________________________
Receive the drug that is being tested
Receive the placebo
Neither the doctors nor patients know who is in the experimental or control group

9. Example 2: pg. 10, #45 Research objective: Sample: Descriptive Stats:
Conclusion:

10. Allow for classification based on an attribute or characteristic
Variables
Variables are the characteristics of the individuals within a population
Qualitative Variables:
Quantitative Variables:
Allow for classification based on an attribute or characteristic
Numerical measures of individuals; performing numerical operations can provide meaningful results

11. Variables Finite or countable # of possible values count
Discrete Variables:
If you can ___________ to get the value of a variable
Continuous Variables:
Finite or countable # of possible values
count
Infinite # of possible values that are countable
measure

12. Variables
Qualitative
Quantitative
Discrete
Continuous

13. Homework
pg. 9-11, #15-41 odd