# Prob/Stats Ch. 1 Test

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1. statistics
to collect, organize, analyze data
2. individuals
people or objects included in a study
3. variable
a characteristic to be studied (age, weight, gender, nationality, etc.)
4. quantative
a value or numerical measurement for operations such as addition or average
5. qualitative
characterizes an individual by grouping based on similarities (categorial)
6. population data
asking every individual in the population
7. sample data
data comes from some of the population (a sample of people)
8. nominal level of measurement
applies to data that consists of name, labels, or categories
9. ordinal level of measurement
applies to data that may be arranged in order. however, differences between data values either cannot be determined or are meaningless
10. interval level of measurement
applies to data that can be arranged in order. differences between data values are meaningful. no starting point and/or no zero
11. ratio level
applies to data that can be arranged in order. both differences between data values and ratios of data values are meaningful. data has a true zero
12. simple random sample
every member of the population has an equal chance of being included in the sample
13. simulation
a numerical representation of a real world phenomenon
14. stratified sampling
all members of the group (strata) are organized from the population based on characteristics. then a sample is drawn from the group
15. systematic sampling
members of the population are sequentially numbered. then, from a starting point, every kth member of the population is included in the sample
16. clustered
the entire population is divided into pre-existing segments or clusters (often geographic). clusters are randomly selected and every cluster member is included
17. convenience sampling
data are used from population members that are readily available
18. census
measurements and observations from an entire population
19. sample
measurements or observations from a representative part of the population should be
20. observational study
observations and measurements of individuals are conducted in a way that doesn't change the response or the variable being measured
21. experiment
measurement is deliberately imposed on the individuals in order to observe a possible change in the response or variable being measured
22. placebo effect
occurs when a subject receives no treatment but (incorrectly) believes he or she is in fact receiving treatment and responds favorably
 Author: laurettaloo22 ID: 102620 Card Set: Prob/Stats Ch. 1 Test Updated: 2011-09-19 00:03:05 Tags: probability statistics Folders: Description: ch. 1 vocab Show Answers: