WGU C955 EXAM QUESTIONS
AND VERIFIED ANSWER; 100%
CORRECT; 2026- 2027 UPDATE
GUIDE A+
, median vs IQR - ANS-skewed data uses these for center and spread
Histogram - when to use - ANS-Based on the shape of the
distribution, uses mean + standard deviation OR median +
IQR to describe
center and spread - Larger data sets; shows
shapes of distribution and potential outliers;
ignores the
individual data valuesl
Histogram Skewed right - ANS-Not a symmetric distribution, the tail is on the right
Standard Deviation Rule - ANS-68% of the data are within 1 standard deviation,
95% are within 2,
99.7% are within 3 standard deviations from the mean.
Scatter plot - ANS-A graphical representation of Q -> Q
If relationship is linear (confirmed using
the scatterplot), use the correlation
coefficient to describe strength of
relationship and the least-squares
regression line to make predictions
Two way table - ANS-A graphical representation of C -> C
Relative frequencies OR conditional
percentages for each row/column of the
explanatory variable
Side-by side box - ANS-A graphical representation of C -> Q
5-number summaries of the response
variables
Interpolation - ANS-Making predictions *within* the range of your data. This is usually
accurate.
AND VERIFIED ANSWER; 100%
CORRECT; 2026- 2027 UPDATE
GUIDE A+
, median vs IQR - ANS-skewed data uses these for center and spread
Histogram - when to use - ANS-Based on the shape of the
distribution, uses mean + standard deviation OR median +
IQR to describe
center and spread - Larger data sets; shows
shapes of distribution and potential outliers;
ignores the
individual data valuesl
Histogram Skewed right - ANS-Not a symmetric distribution, the tail is on the right
Standard Deviation Rule - ANS-68% of the data are within 1 standard deviation,
95% are within 2,
99.7% are within 3 standard deviations from the mean.
Scatter plot - ANS-A graphical representation of Q -> Q
If relationship is linear (confirmed using
the scatterplot), use the correlation
coefficient to describe strength of
relationship and the least-squares
regression line to make predictions
Two way table - ANS-A graphical representation of C -> C
Relative frequencies OR conditional
percentages for each row/column of the
explanatory variable
Side-by side box - ANS-A graphical representation of C -> Q
5-number summaries of the response
variables
Interpolation - ANS-Making predictions *within* the range of your data. This is usually
accurate.
