WGU C955 Probability & Statistics Exam – Grade A+ Questions & Answers ()

WGU C955 PROBABILITY AND
STATISTICS EXAM; GRADE A+
QUESTIONS AND VERIFIED ANSWERS
(LATEST 2025- 2026) 100% CORRECT




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, 1. Boxplot - ANSWERan image that has min, Q1, median, Q3, max

2. Histogram - ANSWER-A graphical representation -- bars, measuring the
frequency within each interval

3. Skewed right - ANSWER-Not a symmetric distribution, the tail is on the right, i.e.
extra stuff on the right

4. Measures of center - ANSWER-Median, the mean (and mode)

5. Measures of spread - ANSWER-Range, IQR & standard deviation

6. 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.

7. For skewed data, use these for center and spread - ANSWER-In this situation,
we use median (for center) & IQR (for spread)

8. Explanatory variable - ANSWER-In a study, what we think is the "cause"

9. Response variable - ANSWER-In a study, what we think is the "effect"

10. Scatter plot - ANSWER-A graphical representation of Q -> Q

11. Two way table - ANSWER-A graphical representation of C -> C

12. Side-by side box - ANSWER-A graphical representation of C -> Q

13. Linear relationship - ANSWER-"shaped like a line"

14. 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).

15. r = -0.2, for example - ANSWER-This is an example of a correlation coefficient
that represents a weak negative correlation.