Test 1 Flashcards
(24 cards)
Statistics
Collection, analysis, and interpretation of data
Individuals
People or things on which data is collected
Variables
The information/data collected in the individuals
Categorical variables
Putting data into groups
Quantitative variables
Data that can be analyzed numerically
Why?
Why collect the data
Who?
What subjects does the data describe? How many?
What?
How many variables? What units of measurement?
Where?
Where does the data come from?
When?
When was the data obtained?
How?
Survey or experiment?
Counts (frequency)
The actual number of times a data value is observed
Rates
Percents or proportions (fractions) often clearer than counts
Distribution
The distribution of a variable tells us values (GRAPH)
Roundoff error
Results from rounding each values
Statistical problem solving process
- Ask a question of interest
- Produce data- observational/experiment
- Analyze data- graphs
- Interpret results- answers question of interest
Sampling variability
Different samples taken will produce different results
Experiment
Imposes treatment
What treatment?
Observational
No treatment is imposed
Sample surveys
A type of observational study that uses sampling. They attempt to measure characteristics of some group of individuals by studying only some of its members
Population
Entire group of interest
Sample
Part of group of interest
Census
A sample survey that attempts to include the entire population
Control group
No treatment (placebo)
