Fundamentos de Probabilidade

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MODULE FUNDAMENTOS DE PROBABILIDAD
PROBABILITY FUNDAMENTALS
Paso 1 de 1
Pregunta 1 de 5
Pregunta 2 de 5
Which of the following is true regarding a probability of an event P(A)?
P (A) ≥ 0
0 ≤ P (A) ≤ 1
P (A) ≤ 1
0 < P (A) < 1
P (A) > 0
P (A) < 1
This is correct. The probability of an event can any number between 0
and 1, including 0 and 1. In other words, the probability of an event
cannot be more than 1 or less than 0.
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Pregunta 3 de 5
Pregunta 4 de 5
Which of the following represents the probability of an event that is more likely
not to occur than it is to occur, but would not be unusual for it to occur?
0.999
1
0.5
0.68
0.001
0.32
Let A be the event that a document will reach its destination on time using a
certain service. If  this means that:P (A) = .98
The document will always reach its destination on time
The document will almost always reach its destination on time
The document will almost never reach its destination on time
The document will never reach its destination on time
This is correct.
This is correct.
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Pregunta 5 de 5
1250 randomly chosen individuals from a certain population are tested for the
presence of the HIV virus, and 20 are found to be carriers of the virus. Based on
this information, what is the estimate of P(V), the probability that a randomly
chosen person from this population carries the HIV virus?
.50
.125
.20
.016
It was estimated that in a certain population roughly 5% carry the HIV virus. A
few years later a researcher wanted to confirm this has not changed. If we let V
be the event that a randomly chosen person from this population carries the
HIV virus, which of the following will provide the most convincing evidence that
indeed P(V) is roughly 0.05?
20 randomly chosen individuals from this population are tested
and 1 of them is found to carry the HIV virus.
2000 randomly chosen individuals from this population are tested
and 205 of them are found to carry the HIV virus.
2000 randomly chosen individuals from this population are tested
and 102 of them are found to carry the HIV virus.
This is correct. Using the relative frequency of V occurring, P(V) is
estimated by .= .01620
1250
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40 randomly chosen individuals from this population are tested
and 2 of them are found to carry the HIV virus.
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This is correct.
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