final Flashcards
(19 cards)
What is a data set?
The data collected for a particular study is called a data set
What is an element?
The individual people, objects, events or other entities that are studied
What is a variable?
Any characteristic of an element
What is cross sectional data?
different data points collected at the same point in time
What is time series data?
the same data point is observed over multiple consecutive time periods
Difference between qualitative and quantitative?
Qualitative: categorical
EXAMPLE: hair color, skin color, job
Quantitative: numerical
EXAMPLE: salary, temperature, height, weight, GPA
What is nominal?
qualitative with no meaningful order
hair color, degree of study, profession, jersey number, telephone number
what is ordinal?
qualitative with an order
EXAMPLE: level of satisfaction, level of education, age group
what is interval?
quantitative with no absolute zero and not proportional
what is ratio?
quantitative with an absolute zero and proportional
EXAMPLE: salary, height, weight
what is primary data?
data that is collected directly through an experiment or observation?
what is secondary data?
is data collected from existing sources (previous experiments by someone else)
what is big data?
refers to massive amounts of data that is collected very fast in real time
what is transactional data?
refers to the information recorded from transactions such as sales or purchases, detailing what was exchanged, between whom and when
what is data warehousing?
the process of centralized data management and retrieval
what is population?
the set of all the elements we are studying
what is sample?
a subset of the population that we study to make inferences about the population
what is descriptive statistics?
the science of describing the important aspects of a data set
what is statistical inference?
the science of using a sample to make generalizations about a population
