# Shared Flashcard Set

## Details

Statistics 1
Stats 120 Terms
38
Mathematics
04/01/2011

Term
 Statistics
Definition
 a group of methods used to collect, analyze, present, and interpret data and to make decisions
Term
 Descriptive Statistics
Definition
 consists of methods for organizing, displaying, and describing data by using table, graphs, and summary measures
Term
 Inferential Statistics
Definition
 Consists of methods that use sample results to help make decisions or predictions about a population
Term
 Population
Definition
 Consists of all elements- individuals, items, or objects, whose characteristics are being studied.
Term
 Target Population
Definition
 The population being studied
Term
 Sample
Definition
 a portion of the population selected for study
Term
 Census
Definition
 A survey that includes every member of a population
Term
 Sample Survey
Definition
 the technique of collecting information from a portion of the population
Term
 Element or Member
Definition
 a specific subject or object about which the info is collected
Term
 Variable
Definition
 a characteristic under study that assumes different values for different elements
Term
 Constant
Definition
 never varies
Term
 Observation or Measurement
Definition
 the value of a variable for an element
Term
 Data Set
Definition
 a collection of observations on one or more variable
Term
 Quantitative Variable
Definition
 can be measured numericaly
Term
 Discrete Variable
Definition
 a variable whose values are countable
Term
 Continuous Variable
Definition
 A variable that can assume any numerical value over a certain interval or intervals
Term
 Qualitative or Categorial Variable
Definition
 a variable that cannot assume a numerical value, but can be classified into two or more non-numeric categories
Term
 Raw Data
Definition
 data recorded in the sequence in which they are collected and before they are processed
Term
 Relative Frequency
Definition
 the frequency of a class or category divided by the sum of frequencies Number in Category Total number
Term
 Histogram
Definition
 A graph in which the classes are marked on the horizontal axis and frequencies, relative frequencies, or percentages are marked on the vertical axis. Bars drawn adjacent to eachother
Term
 Median
Definition
 The value of the middle term in a data set
Term
 Parameters
Definition
 numerical measures from the population
Term
 Mean
Definition
 a measure of the central tendency calculated by dividing the sum of all values by the number of values in the data set
Term
 Standard Deviation
Definition
 a measure of spread that is given by the positive square root of the variance
Term
 variance
Definition
Term
 IQR
Definition
 the difference between the third and the first quartiles   Q3-Q1=IQR
Term
 Empirical Rule
Definition
 68%, 95%, 99.7%
Term
 Percentile Rank
Definition
 gives the percentage of values in the data set that are smaller than this value
Term
 Range
Definition
 The difference between the largest and smallest value
Term
 Quartiles
Definition
 The summary measures that divide a ranked data set into four equal parts
Term
 Outlier
Definition
 Q1-1.5(IQR) Q3+1.5(IQR)
Term
 Simple Event
Definition
 an event composed of one and only one of the final outcomes of an experiment
Term
 Compound Event
Definition
 a collection of more than the outcome of an experiment
Term
 Probability
Definition
 A numerical measure of the likelihood that a specific event will happen.
Term
 Classical Approach
Definition
 the method of assigning probabilities to outcomes or events of an experiment with equally likely outcomes
Term
 Experimental Approach
Definition
 a process with well-defined outcomes that, when performed, result in one and only ones of the outcomes per repetition
Term
 Subjective
Definition
 the probability assigned to an event based on the information and judgement of a person
Term
 Law of Large Numbers
Definition
 if an experiment is repeated again and again
Supporting users have an ad free experience!