STA 2023 Lecture Notes - Lecture 1: Standard Deviation, Categorical Variable, Scatter Plot

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Published on 7 Mar 2019
School
Department
Course
Professor
Statistic
numerical summary of the sample
Parameter
numerical summary of the population
Random Sampling
each member of the population has the same chance of being included in the
sample; tend to be representative of the population
Sample
subjects for whom we have data
Population
all subjects of interest
Variables
the characteristics that we measure on each subject; can take on different values
for each individual
Subjects
persons, animals, or objects in our study/experiment
What is statistics?
the art and science of learning from data; designing studies, analyzing data, and
translating data into knowledge and understanding of the world around us
Design
plan how to obtain the data/ tells us how data was collected
Description
summarize the data with graphs / summarizes data from the sample
Inference
use data from a random and representative sample to draw conclusions about
the population of interest
Categorical Variables
place observations into groups, usually summarized by the percentage
ex. favorite sport, which county lived in, zip-codes
Quantitative Variables
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