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33 Cards in this Set

  • Front
  • Back
Sampling with replacement
A number is not removed from the population because it has occured
Stratified Sampling
Classes or strata are formed inside a population. A simplee random sample is than drawn from each class or strata
Systematic sampling
Every nth element of a population is chosen (like every 12th person)
Cluster sampling
Populations are divided into areas. Areas are than selected at random and every element of the area is tested
Convenience Sampling
Elements chosen by how handy they happen to be
Count everyone or everything
Ask a sample to gather data
Problems with surveys
the sample may be biased, self-selected, or may contain a hidden bias, which is unknown to the surveyor and even the population. you may miss variables when asking your question
Involves the organization of data so as to make sense of the data and possibly predict the future using the data.
Qualitative Data
Data can be separated into different categories that are distinguished by some nonnumerical characteristics
Quantative Data
The data consist of numbers representing counts or measurments
Somewhat arbitrary assignment of a number to an event or item
Discrete Measurements
The data can only have finite number values
Continuous measurement
Infinitely many possiblities for values
The whole set or group
A subset of the population
Set up a control group, an experimental, treat the experimental group and measure what happens.
run a numerical model of the situation, probably on a computer, but not necessarily. (monopoly)
Simple random Sample
Everything or everybody in the population has an equal chance of being chosen
Observational Study
Observe and measure individuals in a way that doesn't change the response or the variable being measured
No treatment or a dummy treatment
Two-treatment experiment: Experiment and control group
Lurking variables
Unknown or hidden effects
Slanting of the data one way or another
Hidden bias
Unknown slanting of hte data one way or another
If the experiment is repeated, do you obtain the sam result? or are the results due to chance alone
Generalizing results
The results for a particular population used for the experiment may not apply to other populations.
Varies from a normal bar graph by the bars always touching and hte width of hte bar represents a quantative value. Need a frequency table
Lower class limit
The smallest number that belongs in a different class
Upper class limit
The largest numbers that belong in the different classes
Class bounddaries
half way between two limits
Class marks
The midpoint of each class
Class width
the difference betwen 2 consecutive lower class limits or boundaries