Data Analysis and Decision Making Question
And Answers
Population - Correct Answer - (statistics) the entire aggregation of items from which samples can be
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
drawn
fm
Sample - Correct Answer - A relatively small proportion of people who are chosen in a survey so as to
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
be representative of the whole.
fm fm fm fm fm
variable - Correct Answer - Attribute or measurement of members of a population
fm fm fm fm fm fm fm fm fm fm fm fm fm
Observation - Correct Answer - list of all variable values for a single member of a population
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
DATA SET - Correct Answer - array of data, variables in columns, observations in rows variable names
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
in tops of rows
fm fm fm fm
data type - Correct Answer - numerical v. categorical, discrete v. continuous, cross-sectional v. time
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
series, categorical=nominal or ordinal
fm fm fm fm
dummy variable - Correct Answer - is a variable for wich all cases falling into a specific category
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
assume the value of 1, and all cases not falling into that category assume a value of 0
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
binned variable - Correct Answer - numerical, categorized into bins/ranges
fm fm fm fm fm fm fm fm fm fm
counts of categories - Correct Answer - numbers of observations in various categories
fm fm fm fm fm fm fm fm fm fm fm fm fm
Percentiles - Correct Answer - values that have specified percents BELOW them
fm fm fm fm fm fm fm fm fm fm fm fm
quartiles - Correct Answer - 25%, 50% or 75% below them
fm fm fm fm fm fm fm fm fm fm fm
concatenate - Correct Answer - string together 2 or more peices of text (&)
fm fm fm fm fm fm fm fm fm fm fm fm fm fm
IQR Interquartile Range - Correct Answer - 3rd -1st quartile 75-25
fm fm fm fm fm fm fm fm fm fm fm
Variance - Correct Answer - average of quared deviations from the mean
fm fm fm fm fm fm fm fm fm fm fm fm
standard deviation - Correct Answer - measure of variability in same units as observations
fm fm fm fm fm fm fm fm fm fm fm fm fm fm
Square root of viarance fm fm fm
empirical rules - Correct Answer - μ +/- 1σ encloses about 68.26% of X's
fm fm fm fm fm fm fm fm fm fm fm fm fm fm
μ +/- 2σ covers about 95% of X's
fm fm fm fm fm fm fm
And Answers
Population - Correct Answer - (statistics) the entire aggregation of items from which samples can be
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
drawn
fm
Sample - Correct Answer - A relatively small proportion of people who are chosen in a survey so as to
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
be representative of the whole.
fm fm fm fm fm
variable - Correct Answer - Attribute or measurement of members of a population
fm fm fm fm fm fm fm fm fm fm fm fm fm
Observation - Correct Answer - list of all variable values for a single member of a population
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
DATA SET - Correct Answer - array of data, variables in columns, observations in rows variable names
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
in tops of rows
fm fm fm fm
data type - Correct Answer - numerical v. categorical, discrete v. continuous, cross-sectional v. time
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
series, categorical=nominal or ordinal
fm fm fm fm
dummy variable - Correct Answer - is a variable for wich all cases falling into a specific category
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
assume the value of 1, and all cases not falling into that category assume a value of 0
fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm fm
binned variable - Correct Answer - numerical, categorized into bins/ranges
fm fm fm fm fm fm fm fm fm fm
counts of categories - Correct Answer - numbers of observations in various categories
fm fm fm fm fm fm fm fm fm fm fm fm fm
Percentiles - Correct Answer - values that have specified percents BELOW them
fm fm fm fm fm fm fm fm fm fm fm fm
quartiles - Correct Answer - 25%, 50% or 75% below them
fm fm fm fm fm fm fm fm fm fm fm
concatenate - Correct Answer - string together 2 or more peices of text (&)
fm fm fm fm fm fm fm fm fm fm fm fm fm fm
IQR Interquartile Range - Correct Answer - 3rd -1st quartile 75-25
fm fm fm fm fm fm fm fm fm fm fm
Variance - Correct Answer - average of quared deviations from the mean
fm fm fm fm fm fm fm fm fm fm fm fm
standard deviation - Correct Answer - measure of variability in same units as observations
fm fm fm fm fm fm fm fm fm fm fm fm fm fm
Square root of viarance fm fm fm
empirical rules - Correct Answer - μ +/- 1σ encloses about 68.26% of X's
fm fm fm fm fm fm fm fm fm fm fm fm fm fm
μ +/- 2σ covers about 95% of X's
fm fm fm fm fm fm fm
