# Shared Flashcard Set

## Details

Types of Data 1.3
Terms of Elementary Statistics 11th Edition
11
Mathematics
01/12/2014

Term
 Statistics
Definition
 is a collection of methods for planning experiments, obtaining data, and then organizing, summarizing, presenting, analyzing, interpreting and drawing conclutions based on the date.   Example: A sample of students is selected from BC and their average (mean) age in years is 23.7.
Term
 Population
Definition
 is the complete collection of all elements (scores, people, measurements, and so on) to be studied. The collection is complete in the sense that it includes all subjects to be studied.
Term
 Sample
Definition
 is a subcollection of elements selected from a population. Example : In a study of household incomes in a small to wn of 1000 households, one might conceivably obtain the income of every household. However, it is probabl y very expensive and time consuming to do this. Therefore, a better approach would be to obtain the data from a portion of the households (let’s say 125 households). In this scenario, the 1000 households ar e referred to as the populat ion and the 125 households are referred to as a sample.
Term
 Parameter
Definition
 is a numerical measurement describing some characteristic of apopulation. Example: In a study of all current major league baseball players,it was found that 78% battedexclusively right-handed.
Term
 Statistic
Definition
 is a numerical measurement describing some characteristic of a sample.Example: In the household incomes example from above,the average (mean) income of all 1000 householdsis a parameter, whereas the average (mean) income of the 125 households is a statistic.
Term
 Discrete data
Definition
 result when you can make a list of all possible values. The use of “...” is permitted when there is an infinite number of possible values. Example: A research poll of 1015 people shows that 752 of them have internet access at work.
Term
 Continuous data
Definition
 result when there is an infinite number of possible values that cannot be made into a list.This type of data is often associated with some sort of physical measurement.Example: The finishing times of a marathon In a study of all current major league baseball players, it was found that 78% batted exclusively right-handed.
Term
 Thenominal level of measurement
Definition
 is characterized by data that consist of names, labels or categoriesonly.The data cannot be arranged in an ordering scheme (such as low to high).Example: The type of blood one has (A, B, AB, or O) Responses to an exit poll were made by 45 Democrats and 80 Republicans and 90 Independents.
Term
 theordinal level of measurement
Definition
 is characterized by data that may be arranged in some order, butdifferences between data values eithercannot be determined or are meaningless.Example: The ranking of a college football team (1, 2, 3, etc.) In a sample of 36 stereo speakers, 12 were rated "good", 16 were rated "better" and 8 were rated "best".
Term
 Theinterval level of measurement
Definition
 is the same as ordinal level, except that differences between data valuesare meaningful. In addition, there isno inherent (natural)zero starting point.Example: The record low temperature for a certain city on this date. The years in which the US was struck by a hurricane.
Term
 Theratio level of measurement
Definition
 is the same as interval level, except that there is an inherent (natural) zero starting point (where zero indicates that none of the quantity is present). For values at this level, differences and ratios are meaningful.Example: The price of a textbook. Note: A\$4 item costs twice as much as a\$2 item (\$4/\$2 = 2). Thus, theratio of \$4 to \$2 is meaningful. However, a 4 star restaurant is not necessarily twice as good as a 2 starrestaurant even though 4/2= 2. In this case, the ratio of 4stars to 2 stars would be meaningless. The lengths (in minutes) of movies that are currently playing at a movie theater complex.
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