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Stats NIE Hw 4

# Stats NIE Hw 4 - Statistics I Professor Jun Nie Section 4-2...

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Statistics I Professor Jun Nie Recitation: Tue 2-3:15 Section 4-2 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 4-3 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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