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24 Cards in this Set

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Descriptive statistics
the branch of statistics that involves the organization, summarization and display data
Inferential statistics
the branch of statistics that involves using a sample to draw conclusions about a population
Qualitative data
attributes, labels, nonnumerical entries
Quantitative data
numerical measurements or counts
Nominal level of measurement
Qualitative only. Categorized using names, labels or qualities. No mathematical computations can be made at this level
Ordinal level of measurement
Qualitative or quantitative. Data can be arranged in order but differences between data entries are not meaningful
Interval level of measurement
Quantitative. Data can be ordered and you can calculate menaingful differences between data entries. A zero entry simply represents a position on a scale, it is not an inherent 0. ZERO MEANS SOMETHING (0 degrees celsius)
Ratio level of measurement
Quantitative. Data can be ordered and you can calculate menaingful differences between data entries. A zero entry is an inherent 0. A ratio of two data values can be formed so one data value can be expressed as a multiple of another. ZERO MEANS NOTHING.
Observational study
study by observing
Experimental study
change a variable and observe result
Simulation study
machine/model produces situation or process
Survey study
ask people by phone, mail, etc.
census
count/measure of entire population
sampling
count/measure of part of a population
random sample
every member of the population has an equal chance of being selected
simple random sample
every possible sample of the same size has the same chance of being selected
stratified sample
population is divided into groups (strata) then a sample is selected from each
cluster sample
population is divided into groups (clusters) and sample is taken all members of one or more clusters, but not all
systematic sample
each member of a population is assigned a number, ordered, and a starting number is randomly selected. Sample members are selected at regular intervals from the starting number
convenience sample
consists only of available members of a population
mean
average of a set of numbers

n1+n2+n3+nx
____________
x
median
middle # when data is arranged in order

1, 2, 3, 8, 10 =8
1, 2, 3, 4, 5, 8 =(3+4)/2=3.5
mode
data with highest frequency
2, 1, 2, 3, 4, 2 =2 (unimodal)
AB,O, A, B, A, O =A,O(bimodal)
3, 4, 7, 2, 3, 4, 7, 2 =none
cannot have more than 2 modes
modal class
class with the highest frequency