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1.
Decide if the probability described is a subjective (personal) probability or a relative frequency probability: In a sample of 1000 students majoring in the humanities, 660 were female.
The 66% (660/1000) chance of a humanities major being female is a
A) subjective probability.
B) relative frequency probability.
2.
Decide if the probability described is a subjective (personal) probability or a relative frequency probability: Among 5000 new tires sold by a tire company, 20% (1000/5000) lasted more
than 100,000 miles. The 20% chance that a new tire will last more than 100,000 miles is a
A) subjective probability.
B) relative frequency probability.
3.
A statistics class has 4 teaching assistants (TAs): three female assistants (Lauren, Rona, and Leila) and one male assistant (Josh). Each TA teaches one discussion section. A student picks
a discussion section. The two events W = {the TA is a woman} and J = {the TA is Josh} are
A) independent events.
B) disjoint (mutually exclusive) events.
C) each simple events.
D) None of the above.
4.
A birth is selected at random. Define events B = {the baby is a boy} and F = {the mother had the flu during her pregnancy}. The events B and F are
A) disjoint but not independent.
B) independent but not disjoint.
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 Fall '08
 BARROSO,JOAOR
 Statistics, Probability

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