1. Probability and Statistics
Chapter 1 Notes

2. Probability and Statistics
Chapter 1 Notes
 I. Section 1-1
A. Statistics is the science of collecting, organizing, analyzing, and interpreting data in order to make decisions.
1. Data is information coming from observations, counts, measurements, or responses.
a. There are 2 types of data sets.
1) Population – the collection of all outcomes, responses, measurements, or counts that are of interest.
a) the set of all possible measurements, counts or observations that are of interest in a particular study.

3. Probability and Statistics
Chapter 1 Notes
 I. Section 1-1
2) Sample – A subset of the population.
a) Since it is usually impractical or even impossible in terms of time or money to obtain every possible response, we must often rely on information obtained from a sample.
b) Random Sample: -- A sample in which every member of the population has an equal chance of belonging.

4. Probability and Statistics
Chapter 1 Notes
 I. Section 1-1
b. There are 2 types of numerical descriptions
1) Parameter – A numerical description of a population characteristic.
2) Statistic – A numerical description of a sample characteristic.
B. Branches of Statistics
1. Descriptive Statistics
a. The branch of statistics that involves the organization, summarization, and display of data.
2. Inferential Statistics.
a. The branch of statistics that involves using a sample to draw conclusions about a population.
1) A basic tool in the study of inferential statistics is probability.

5. Assignment:
Classwork: Pages 8-10, #1-38 ALL