STATISTICS BEC1 WGU EXAM SCRIPT 2026
COMPLETE QUESTIONS AND SOLUTIONS
GRADED A+
⩥ Variance. Answer: -average (or mean) of the squared deviations.
⩥ Standard deviation. Answer: -the square of the variance
⩥ Larger the standard deviation the more spread-out
Smaller the standard deviation the closer to the mean. Answer: TRUE
⩥ Properties of Standard Deviation. Answer: + or - a constant to every
score does not change the standard deviation
70% of scores are within 1 standard deviation of mean
95% of scores are within 2 standard deviations of mean
⩥ Z-SCORES:. Answer: the sign tells you if you are above or below the
mean
, the number indicates how many standard deviations away from the mean
⩥ Z-Distribution. Answer: 1) Mean of z-distribution always = 0
2) Standard deviation of z-distribution = 1
3) Shape of z-distribution is same shape as the original X-distribution
⩥ Z-Distribution. Answer:
⩥ Probability. Answer: =defined as a proportion
-inferential statistics relies on this
-inferences about populations based upon samples
⩥ Normal Curve. Answer: -important distribution
-symmetrical
⩥ Small Portion = Tail
Larger Portion = Body. Answer: True
⩥ bigger samples, closer to mean (approx. normal). Answer: TRUE
COMPLETE QUESTIONS AND SOLUTIONS
GRADED A+
⩥ Variance. Answer: -average (or mean) of the squared deviations.
⩥ Standard deviation. Answer: -the square of the variance
⩥ Larger the standard deviation the more spread-out
Smaller the standard deviation the closer to the mean. Answer: TRUE
⩥ Properties of Standard Deviation. Answer: + or - a constant to every
score does not change the standard deviation
70% of scores are within 1 standard deviation of mean
95% of scores are within 2 standard deviations of mean
⩥ Z-SCORES:. Answer: the sign tells you if you are above or below the
mean
, the number indicates how many standard deviations away from the mean
⩥ Z-Distribution. Answer: 1) Mean of z-distribution always = 0
2) Standard deviation of z-distribution = 1
3) Shape of z-distribution is same shape as the original X-distribution
⩥ Z-Distribution. Answer:
⩥ Probability. Answer: =defined as a proportion
-inferential statistics relies on this
-inferences about populations based upon samples
⩥ Normal Curve. Answer: -important distribution
-symmetrical
⩥ Small Portion = Tail
Larger Portion = Body. Answer: True
⩥ bigger samples, closer to mean (approx. normal). Answer: TRUE
