Wgu_C955_Applied_Probability_And_Statistics_Test_Bank_All_Modules (4).Pdf

WGU C955 APPLIED PROBABILITY AND
STATISTICS TEST BANK ALL MODULES
MASTER
⫸ Histogram Answer: A graphical representation -- bars, measuring the
frequency within each interval


⫸ Skewed right Answer: Not a symmetric distribution, the tail is on the
right, i.e. extra stuff on the right


⫸ Measures of center Answer: Median, the mean (and mode)


⫸ Measures of spread Answer: Range, IQR & standard deviation


⫸ Standard Deviation Rule Answer: 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 Answer: In this
situation, we use median (for center) & IQR (for spread)


⫸ Explanatory variable Answer: In a study, what we think is the
"cause"

, ⫸ Response variable Answer: In a study, what we think is the "effect"


⫸ Scatter plot Answer: A graphical representation of Q -> Q


⫸ Two way table Answer: A graphical representation of C -> C


⫸ Side-by side box Answer: A graphical representation of C -> Q


⫸ Linear relationship Answer: "shaped like a line"


⫸ Correlation coefficient, r Answer: 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 Answer: This is an example of a correlation
coefficient that represents a weak negative correlation.


⫸ r = 0.9, for example Answer: This is an example of a correlation
coefficient that represents a strong positive correlation.


⫸ Linear regression line Answer: A line that fits the data as close as
possible, used to make predictions