What is Statistics?
Statistics in general is the science of learning from data. We use data to study the past and to predict future experiences. It is concerned with the collection, analysis, and interpretation of data, as well as the effective communication and presentation of results relying on data.
Statistics is the science of:
- Collecting Data
- Analyzing Data
- Drawing conclusions from data.
Statistics breaks down into four different steps:
- Ask a question.
- Collect data.
- Display results.
- Draw conclusions.
Statistics is broken into two branches:
- Descriptive Statistics
- Describes the basic features of the data in a study. With descriptive statistics you are describing what is or what the data shows.
- Includes methods of:
- Organizing data.
- Summarizing data.
- Graphically displaying data.
- Using numerical formulas to describe the nature of data.
- Inferential Statistics
- Is defined as the branch of statistics that is used to make inferences about the characteristics of a population based on sample data.
Types of Data
There are two types of data:
Primary Data: Data found by yourself. Primary data tends to be more reliable.
Secondary Data: Data you got from another source. Secondary data is not reliable since you are not 100% sure that your source is being honest. It is key to trust the source.
Ways to Split Data:
Quantitative: Data the collects quantity.
Ex: How tall is a person? The answer would be a number.
Qualitative: Data that does not collect any numeral information but collects data related to quality.
Ex: What color of hair does a person have?