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QuestionAnswer
elements the entities on which data are collected
variable a characteristic of interest for the elements
observation set of measurements obtained for a particular element
what are the scales of measurement required by data collection? nominal, ordinal, interval, or ratio
nominal scale of measurement when the data for a variable consist of labels or names used to identify an attribute of the element; numeric or nonnumeric
ordinal scale of measurement when data exhibits the properties of nominal data and in addition, the order or rank of the data is meaningful; numeric or nonnumeric
interval scale of measurement when the data have all the properties of ordinal data and the interval between values is expressed in terms of a fixed unit of measure; always numeric
ratio scale of measurement when the data have all the properties of interval data and the ratio of two values is meaningful; must contain a zero value; ex: distance, height, weight, time
cross-sectional data data collected [for different things] at the same or approximately the same point in time
time series data data collected over several time periods [for the same thing]
descriptive statistics tabular, graphical, and numerical summaries of data
quantitative data are always numeric
The number of observations in a complete data set having 10 elements and 5 variables is 10
population The collection of all elements of interest in a particular study
what is the most common type of observational study? survey
how does Dr. Kurt Thearling, a leading practitioner in the field, define data mining? the automated extraction of predictive information from databases
A Scanner Data User Survey of 50 companies found that the average amount spent on scanner data per category of consumer goods was $387,325. The $387,325 is an example of quantitative data and a descriptive statistics
Which scale of measurement can be either numeric or nonnumeric? nominal and ordinal
a data set with n variables contains how many observations? n
how do you calculate the total number of data values in a complete data set? number of elements multiplied by the number of variables
list the scales of measurement in order of amount of information contained nominal, ordinal, interval, ratio
statistical inference the process of using data obtained from a sample to make estimates and test hypotheses about the characteristics of a population
census collecting data for the entire population
sample survey collecting data for a sample
Created by: geminijester617
 

 



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