WGU C459 Statistics Exam Questions & Answers
The probability of any event is between one and o. What is the equation for this? – \u2714\u2714For any
event A, 0 \u2264 P(A) \u2264 1.
The sum of all possible probabilities is___? – \u2714\u2714One, the equation is :P(S) = 1
What is the complement rule? or the probability that an event does not occur is 1 minus the
probability that it does occur. – \u2714\u2714P(not A) = 1 – P(A)
In probability, “OR” means either one or the other or both. – \u2714\u2714P(A or B) = P(event A occurs or
event B occurs or both occur)
Two events that cannot occur at the same time are called – \u2714\u2714disjoint or mutually exclusive
The Addition Rule for Disjoint Events: – \u2714\u2714If A and B are disjoint events, then P(A or B) =
P(A) + P(B).
P(A and B) = – \u2714\u2714P(event A occurs and event B occurs)
The idea of disjoint events is – \u2714\u2714is about whether or not it is possible for the events to occur at
the same time<\/p>\n\n\n\n
The idea of independent events is about – \u2714\u2714whether or not the events affect each other in the
sense that the occurrence of one event affects the probability of the occurrence of the other
If A and B Disjoint – \u2714\u2714A and B can not be indepentdent
If A and B are two independent events (Multiplication Rule) – \u2714\u2714P(A and B) = P(A) * P(B).
if A, B and C are three independent events, – \u2714\u2714P(A and B and C) = P(A) * P(B) * P(C)
The Complement Rule, – \u2714\u2714P(A) = 1 – P(not A),
P(L) = 1 – P(not L) = 1 – P(not O1 and not O2 and not O3 and not O4 and not O5 and not O6 and
not O7 and not O8 and not O9 and not O10). – \u2714\u2714Applying the Multiplication rule:Now, using
the multiplication rule, = 1 – (.56 * .56 * .56 * .56 * .56 * .56 * .56 * .56 * .56 * .56) = 1 – .003 =
.997.
P(at least one person chosen has blood type O) – \u2714\u2714P((O and O) or (O and not O) or (not O and
O)) = (.44 * .44) + (.44 * .56) + (.56 * .44) = .6864.
If A and B are disjoint events – – \u2714\u2714P(A and B)= 0
<\/p>\n","protected":false},"excerpt":{"rendered":"
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