WGU C955 EXAM QUESTIONS WITH COMPLETE ANSWERS LATEST UPDATE

WGU C955 EXAM QUESTIONS WITH COMPLETE ANSWERS LATEST
UPDATE

Histogram - when to use - ✔✔ 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 - ✔✔ Not a symmetric distribution, the tail is on the right



Standard Deviation Rule - ✔✔ 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 - ✔✔ 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 - ✔✔ A graphical representation of C -> C

Relative frequencies OR conditional

percentages for each row/column of

the explanatory variable



Stratified sample - ✔✔ all groups are chosen, only some people within each group arestudied



P(A)*P(B) - ✔✔ independent events: P(A and B) =



P(A|B) or P(BIA) - ✔✔ P(A and B) ÷ P(B) or P(A and B) ÷ P(A)



P(A or B) - ✔✔ P(A) + P(B) - P(A and B)



Box plot - ✔✔ Larger data sets; shows the

5-number summary, shows

spread; ignores individual

data values and the number

of values (allowing to

compare sets of different

sizes)