STT 231 Practice Questions with 100% Correct
Answers
observational units (cases)
what is sample data made up of?
variable
what is any characteristic recorded for each case?
categorical variables
variables that assign observational units to a "level, placing each case into exactly one of two
or more categories
quantitative variable
variables that measure a numerical quantity for each case. Unlike categorical variables,
numerical operations like adding and averaging make sense for quantitative variables
continuous "measurement" and discrete "counting"
what two groups can quantitative variables be further divided into?
quantitative, discrete variables
variables that can only take on a limited number of quantities within an interval
quantitative, continuous variables
variables that can take on any value within an interval
nominal "no arrangement" and ordinal "there IS a logical arrangement"
what two groups can categorical variables be further divided into?
, continuous
what kind of variable is a patient's age in years?
nominal
what kind of variable is whether the patient currently smokes (Yes/No)
continuous
what kind of variable is weight/height in (lbs/in^2)
ordinal
what kind of variable is vitamin use coded as 1=regularly, 2=occasionally, 3=no?
continuous
what kind of variable is concentration of beta-carotene (ng/ml) in the blood?
discrete
what kind of variable is number of current prescriptions patient is currently taking?
nominal
what kind of variable is whether or not you were born in Michigan?
ordinal
what kind of variable is the day of the week on which you were born?
continuous
what kind of variable is how many miles you currently are form where you were born
(distance)?
discrete
Answers
observational units (cases)
what is sample data made up of?
variable
what is any characteristic recorded for each case?
categorical variables
variables that assign observational units to a "level, placing each case into exactly one of two
or more categories
quantitative variable
variables that measure a numerical quantity for each case. Unlike categorical variables,
numerical operations like adding and averaging make sense for quantitative variables
continuous "measurement" and discrete "counting"
what two groups can quantitative variables be further divided into?
quantitative, discrete variables
variables that can only take on a limited number of quantities within an interval
quantitative, continuous variables
variables that can take on any value within an interval
nominal "no arrangement" and ordinal "there IS a logical arrangement"
what two groups can categorical variables be further divided into?
, continuous
what kind of variable is a patient's age in years?
nominal
what kind of variable is whether the patient currently smokes (Yes/No)
continuous
what kind of variable is weight/height in (lbs/in^2)
ordinal
what kind of variable is vitamin use coded as 1=regularly, 2=occasionally, 3=no?
continuous
what kind of variable is concentration of beta-carotene (ng/ml) in the blood?
discrete
what kind of variable is number of current prescriptions patient is currently taking?
nominal
what kind of variable is whether or not you were born in Michigan?
ordinal
what kind of variable is the day of the week on which you were born?
continuous
what kind of variable is how many miles you currently are form where you were born
(distance)?
discrete
