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# STA CH 1

### CH 1

Statistics Is the science of data
Two branches of statistics? Descriptive statistics,Inferential statistics
Descriptive Statistics Consists of the collection, organization, summarization, and presentation of data
Inferential Statistics Consists of generalizing from samples to populations by.. Performing estimations and hypothesis tests,Determining relationships among variables,Making predictions, Uses probability( the chance of an event occurring)
Population Consists of all subjects (human or otherwise) that are being studied.
Sample Is a group of subjects selected from a population.
Variable Is a characteristic or attribute that can assume different values.
Data are the values (measurements or observations) that the variables can assume.
Random variable variables whose values are determined by chance.
Types of Data Variables can be classified as qualitative or quantitative
Qualitative variables that can be placed into distinct categories, according to some characteristic or attribute
Quantitative variables that are numerical and can be ordered or ranked
Qualitative Variables Categorical, Can be further classified into two groups, nominal and ordinal
Nominal Data data can be classified into mutually exclusive (non-overlapping) categories in which no order or ranking can be imposed.
Ordinal data can be classified into categories that can be ranked or ordered
Quantitative Variables Numerical,Can be further classified into two groups, discrete and continuous.
Discrete variables can be assigned values such as 0, 1, 2, 3 and are said to be countable. Obtained by counting
Continuous variables can assume an infinite number of values in an interval between two specific values. Obtained by measuring
inferential statistics goal learn about a population by using a sample
unbiased samples Each subject in the population has an equally likely chance of being selected.
Observational study the researcher observes what is happening (or what has happened in the past) and tries to draw conclusions based on these observations.
Experimental study the researcher manipulates one of the variables and tries to determine how the manipulation influences other variables.
independent variable one that is being manipulated by the researcher
dependent variable the outcome
Created by: sarahs_93