STUDYSAGE
Probability and Statistics,
WGU C955 EXAM|complete
study guide with updated
answers.|newest 2025
Boxplot - CORRECT ANSWERS✔️✔️an image that has min, Q1, median, Q3, max
Histogram - CORRECT ANSWERS✔️✔️A graphical representation -- bars,
measuring the frequency within each interval
Skewed right - CORRECT ANSWERS✔️✔️Not a symmetric distribution, the tail is
on the right, i.e. extra stuff on the right
Measures of center - CORRECT ANSWERS✔️✔️Median, the mean (and mode)
Measures of spread - CORRECT ANSWERS✔️✔️Range, IQR & standard deviation
Standard Deviation Rule - CORRECT ANSWERS✔️✔️68% of the data are within 1
standard deviation, 95% are within 2, 99.7 are within 3 standard deviations from
the mean.
For skewed data, use these for center and spread - CORRECT ANSWERS✔️✔️In
this situation, we use median (for center) & IQR (for spread)
Explanatory variable - CORRECT ANSWERS✔️✔️In a study, what we think is the
"cause"
SUCCESS
, STUDYSAGE
Response variable - CORRECT ANSWERS✔️✔️In a study, what we think is the
"effect"
Scatter plot - CORRECT ANSWERS✔️✔️A graphical representation of Q -> Q
Two way table - CORRECT ANSWERS✔️✔️A graphical representation of C -> C
Side-by side box - CORRECT ANSWERS✔️✔️A graphical representation of C -> Q
Linear relationship - CORRECT ANSWERS✔️✔️"shaped like a line"
Correlation coefficient, r - CORRECT ANSWERS✔️✔️Between -1 and 1; measures
how close the points are to the line and if the trend is uphill (positive) or downhill
(negative).
r = -0.2, for example - CORRECT ANSWERS✔️✔️This is an example of a
correlation coefficient that represents a weak negative correlation.
r = 0.9, for example - CORRECT ANSWERS✔️✔️This is an example of a correlation
coefficient that represents a strong positive correlation.
Linear regression line - CORRECT ANSWERS✔️✔️A line that fits the data as close
as possible, used to make predictions
SUCCESS
Probability and Statistics,
WGU C955 EXAM|complete
study guide with updated
answers.|newest 2025
Boxplot - CORRECT ANSWERS✔️✔️an image that has min, Q1, median, Q3, max
Histogram - CORRECT ANSWERS✔️✔️A graphical representation -- bars,
measuring the frequency within each interval
Skewed right - CORRECT ANSWERS✔️✔️Not a symmetric distribution, the tail is
on the right, i.e. extra stuff on the right
Measures of center - CORRECT ANSWERS✔️✔️Median, the mean (and mode)
Measures of spread - CORRECT ANSWERS✔️✔️Range, IQR & standard deviation
Standard Deviation Rule - CORRECT ANSWERS✔️✔️68% of the data are within 1
standard deviation, 95% are within 2, 99.7 are within 3 standard deviations from
the mean.
For skewed data, use these for center and spread - CORRECT ANSWERS✔️✔️In
this situation, we use median (for center) & IQR (for spread)
Explanatory variable - CORRECT ANSWERS✔️✔️In a study, what we think is the
"cause"
SUCCESS
, STUDYSAGE
Response variable - CORRECT ANSWERS✔️✔️In a study, what we think is the
"effect"
Scatter plot - CORRECT ANSWERS✔️✔️A graphical representation of Q -> Q
Two way table - CORRECT ANSWERS✔️✔️A graphical representation of C -> C
Side-by side box - CORRECT ANSWERS✔️✔️A graphical representation of C -> Q
Linear relationship - CORRECT ANSWERS✔️✔️"shaped like a line"
Correlation coefficient, r - CORRECT ANSWERS✔️✔️Between -1 and 1; measures
how close the points are to the line and if the trend is uphill (positive) or downhill
(negative).
r = -0.2, for example - CORRECT ANSWERS✔️✔️This is an example of a
correlation coefficient that represents a weak negative correlation.
r = 0.9, for example - CORRECT ANSWERS✔️✔️This is an example of a correlation
coefficient that represents a strong positive correlation.
Linear regression line - CORRECT ANSWERS✔️✔️A line that fits the data as close
as possible, used to make predictions
SUCCESS
