Statistics I
Professor Jun Nie
Recitation: Tue 23:15
Section 42
4, 6, 8, 14, 22, 26
4. I have been on an elevator very many times, and have never gotten stuck between floors.
Therefore the probability that the next time the elevator will get stuck the next time I ride it is
zero, or very close to zero.
6.
a) .5
b) .2
c) .01
8.
a) 1
b) 0
c) .1
d) .5
e) .2
14.
a) 831 / (831 + 18) =
0.979
b) .975
c) .025
22. The .04 probability that the treatment group would show improvement despite an ineffective
drug indicates that it is very unusual for a person treated with ineffective drug to show
improvement. This is because .04 is a very small probability, and that 4% of a normal
distribution lies beyond the second standard deviation.
26.
a) Brown blue ; Brown Brown ; blue blue
b) .25
c) .75
Section 43
2, 8, 10, 14, 16, 18
2. The addition rule states that to find the probability of only one of two events occurring, you
add up the probabilities and subtract the overlapping probability of them both occurring.
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 Spring '08
 Hall
 Probability, Probability theory, intoxicated Driver

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