If P(A) is the probability that it's raining in Amherst, which of the following would equal the probability that it's not raining in Amherst?
a. 1 / P(A)
b. P(A) / 1
c. 1 - Pr(A)
d. P(A) - P(~A)
Suppose that at this time of year, it rains at some point in the day on about a quarter of the days. Before getting any additional evidence, what are the prior odds that it's going to rain at some point in the day?
a. 1 : 3
b. 1 : 4
c. 4 : 1
d. 3 : 1
1. Ans: c. 1 - Pr(A)
If P(A) is the probability of an event, then 1 - P(A) is the probability of the complement of the event.
2. P(rain) = 1/4
P(no rain) = 1 - 1/4 = 3/4
Odds that its going to rain = P(rain) : P(no rain)
= 1/4 : 3/4
= 1 : 3
Ans: a. 1 : 3
If P(A) is the probability that it's raining in Amherst, which of the following would equal...
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