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Statistics (120)
STA220H5 (15)
Lecture

# STA220 - LECTURE 1 NOTES.docx

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School
University of Toronto Mississauga
Department
Statistics
Course
STA220H5
Professor
Olga Fraser
Semester
Fall

Description
LECTURE 1 NOTES STATISTICS is the science of data. It involves collecting, summarizing, organizing, analyzing, and interpreting data. DATA is a set of observations, measurements, or facts. QUANTITATIVE DATA are numbers that occur in a natural and obvious way. QUALITATIVE DATA are not natural numbers and are usually categories. ______________________________________________________________________________________________________ A POPULATION is a set of units that we are interested in studying. AN EXPERIMENTAL UNIT is an object that we are interested in. A VARIABLE is a characteristic or a property of a population unit. A SAMPLE is a subset of the population units. A REPRESENTATIVE SAMPLE shows characteristics typical of the target population. A RANDOM SAMPLE is one where every unit of the population has an equal chance of being selected. ______________________________________________________________________________________________________ DESCRIPTIVE STATISTICS uses graphs and numbers to find patterns and to summarize and present information contained in a data set. INFERENTIAL STATISTICS uses sample data to make generalizations about a larger set of data whic
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