WGU D582 Statistics for researchers Question
with Verified Correct Answers
Ordinal
sorts data in to groups that have order, ranking
Nominal
Sorts data in to groups or categories, qualitative
Ratio
Both differences and ratios are meaningful, quantitative, there is a zero point
Interval
Difference between values is meaningful and consistent, quantitative, there is no zero point
discreet variable
Countable values, whole numbeer
continuous
Infinite possible values, can be measured
Random sample
Every member has equal chance of being selected
stratified sample
Divides population in to subgroups based on characteristic, then randomly pulls from each
cluster sample
Divides population in to clusters based on geographical or organizational boundaries
, systematic sample
Select every K-th individual after choosing a random starting point.
convenience sample
non random, chosen from what's easiest or most convenient
purposive sample
individuals selected intentionally based on characteristics
Mean
average, add all values and divide by number of values
median
middle value when arranged in order
mode
value that appears most frequently
range
maximum to minimum value
variance
average difference of each data point from the mean. indicates spread
standard deviation
68 one, 95 two, 99.7 three
interquartile range
shows the range of the middle half of the data set
with Verified Correct Answers
Ordinal
sorts data in to groups that have order, ranking
Nominal
Sorts data in to groups or categories, qualitative
Ratio
Both differences and ratios are meaningful, quantitative, there is a zero point
Interval
Difference between values is meaningful and consistent, quantitative, there is no zero point
discreet variable
Countable values, whole numbeer
continuous
Infinite possible values, can be measured
Random sample
Every member has equal chance of being selected
stratified sample
Divides population in to subgroups based on characteristic, then randomly pulls from each
cluster sample
Divides population in to clusters based on geographical or organizational boundaries
, systematic sample
Select every K-th individual after choosing a random starting point.
convenience sample
non random, chosen from what's easiest or most convenient
purposive sample
individuals selected intentionally based on characteristics
Mean
average, add all values and divide by number of values
median
middle value when arranged in order
mode
value that appears most frequently
range
maximum to minimum value
variance
average difference of each data point from the mean. indicates spread
standard deviation
68 one, 95 two, 99.7 three
interquartile range
shows the range of the middle half of the data set
