Lesson 1

• Statistics defined as a science that studies data to make decisions.
• Statistics came from the word state.
• Variable - an attribute that describes a person, place, thing, or idea.
• Qualitative (Observable) Quantitative (Measurable)
• Qualitative variable - a variable that isn't numerical.
• Quantitative variable - a numerical variable.
• Nominal variable - used to name, label, or categorized (ex. residence, color)
• Ordinal variable - number that tells position (ex. 1st, 2nd, 3rd)
• Population is a set of all possible values of a variable.
• Sample is a subgroup of a universe or population.
• Random variable is a variable whose possible values are numerical outcomes of a random phenomenon.
• Discrete - value is obtained by counting and has finite numbers, it can be represented by whole numbers.
• Continuous - value is obtained by measuring and has infinite number, it cannon be represented by whole numbers.