WGU C955 PROBABILITY AND STATISTICS OBJECTIVE ASSESSMENT UPDATED ACTUAL EXAM QUESTIONS AND CORRECT ANSWERS

WGU C955 PROBABILITY AND STATISTICS
OBJECTIVE ASSESSMENT UPDATED ACTUAL
EXAM QUESTIONS AND CORRECT ANSWERS


◉ Range.
Answer: Range = highest value - lowest value


◉ Basic probability.
Answer: P(A) = favorable outcomes / total outcomes


◉ AND probability.
Answer: P(A and B) = P(A) x P(B)


◉ OR probability.
Answer: P(A or B) = P(A) + P(B) - P(A and B)


◉ Mutually exclusive OR.
Answer: P(A or B) = P(A) + P(B)


◉ Complement rule.
Answer: P(not A) = 1 - P(A)

, ◉ Slope.
Answer: m = (y2 - y1) / (x2 - x1)


◉ Linear equation.
Answer: y = mx + b


◉ Expected value.
Answer: E = sum of each outcome x its probability


◉ Population.
Answer: The entire group being studied.


◉ Sample.
Answer: A smaller group taken from the population.


◉ Random sample.
Answer: Every member has a fair chance of being selected.


◉ Observational study.
Answer: Researchers observe without assigning treatments.