HS3801 Midterm| HS 3801 Midterm Exam –
200+ Study Guide Questions,Answers and Core
Topics
What are the most commonly used measures of central tendency?
mean, median and mode
What are the most commonly used measured of dispersion?
standard deviation, variance and coefficient of variation
What are the three basic descriptors of data?
center (mean, median and mode), spread/dispersion (range, SD, coefficient of variation) and location
List the levels of measurement in order of increasing precision
nominal (least precise)
ordinal
interval
ratio (most precise)
Categorical measurement variables
,nominal and ordinal variables
unequal distance between points
Continuous measurement variables
interval and ratio variables
What is nominal data?
categorical data with no implicit ordering (no ordering to the categories)
cannot be added, subtracted, multiplied or divided
categories must be mutually exclusive
can be summarized with mode only (most occuring)
What is ordinal data?
categorical data with implicit (or explicit) ordering
categories can be placed in order
unequal distance between points
cannot be added, subtracted, multiplied or divided
summarized with median and mode
, What is interval data?
continuous (equal distance between points)
no meaningful zero
can be added or subtracted (equal distance)
cannot be multiplied or divided (no meaningful zero)
can be summarized with mean, median, or mode
can be negative due to no meaningful zero
What is ratio data?
continuous (equal distance between points)
meaningful zero
can be added, subtracted, multiplied and divided
can be summarized with mean, median, or mode
When can ordinal data be treated as interval data?
1) you are aggregating multiple items
200+ Study Guide Questions,Answers and Core
Topics
What are the most commonly used measures of central tendency?
mean, median and mode
What are the most commonly used measured of dispersion?
standard deviation, variance and coefficient of variation
What are the three basic descriptors of data?
center (mean, median and mode), spread/dispersion (range, SD, coefficient of variation) and location
List the levels of measurement in order of increasing precision
nominal (least precise)
ordinal
interval
ratio (most precise)
Categorical measurement variables
,nominal and ordinal variables
unequal distance between points
Continuous measurement variables
interval and ratio variables
What is nominal data?
categorical data with no implicit ordering (no ordering to the categories)
cannot be added, subtracted, multiplied or divided
categories must be mutually exclusive
can be summarized with mode only (most occuring)
What is ordinal data?
categorical data with implicit (or explicit) ordering
categories can be placed in order
unequal distance between points
cannot be added, subtracted, multiplied or divided
summarized with median and mode
, What is interval data?
continuous (equal distance between points)
no meaningful zero
can be added or subtracted (equal distance)
cannot be multiplied or divided (no meaningful zero)
can be summarized with mean, median, or mode
can be negative due to no meaningful zero
What is ratio data?
continuous (equal distance between points)
meaningful zero
can be added, subtracted, multiplied and divided
can be summarized with mean, median, or mode
When can ordinal data be treated as interval data?
1) you are aggregating multiple items
