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PUBH 6002 Biostatistics EXAM QUESTIONS WITH COMPLETE SOLUTIONS
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PUBH 6002 Biostatistics EXAM QUESTIONS WITH COMPLETE SOLUTIONS
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intersection - correct answer -the probability both A & B occur togetherunion - correct answer -the probability of A occurring, B occurring, or both A & B
occurring
Probability - correct answer -likelihood that a particular event will occur
A/N
where A = frequency N= observation
must be between 0 and 1
mean - correct answer -average
median - correct answer -middle # of set
mode - correct answer -most common #
range - correct answer -difference between the highest and lowest scores
Can A and B be both mutually exclusive and independent? - correct answer -If A and
B are nontrivial events, then they cannot be both mutually exclusive and
independent. Being mutually exclusive is a lack of independence.
(their probabilities do not =0 )
population - correct answer -complete collection of all elements to be studied
event - correct answer -any result or outcome of interest
can occur or not occur
frequency - correct answer -number of times an event occurs
, observations - correct answer -number of times it is possible for an event to occur
probability - correct answer -likelihood that a particular event will occur
expressed as a ratio of frequency to observations
frequency is always less than observations
P(A) - correct answer -probability of event occurring
mutually exclusive - correct answer -two events that cannot occur at the same time
always = 0
(separate)
not mutually exclusive - correct answer -P(A or B) = P(A) + P(B) - P(A and B)
Events that can occur at the same time
(overlap)
Addition Rule of Probability - correct answer -P(A or B) = P(A) + P(B) - P(A and B)
or
(A+B)/N = A/N + B/N
(1) used to determine the probability that at least one of two events will occur
complementary events (notation A^-) - correct answer -Two or more mutually
exclusive events that together cover all possible outcomes. The sum of the
probabilities of complementary events is 1.
must be:
mutually exclusive
collectively exhaustive
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