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Unformatted text preview: Using the normal approximation to the binomial, what is Pr[X < 23]? .0005 .9995 .9997 Question 7 10 points Let X be a binomial random variable, where n = 50 and p = .25 (mu = 12.5 and sigma = 3.062). Using the normal approximation to the binomial, what is the Pr[12 < X < 23]? .4997 .5633 .4995 Question 8 10 points Virginia Tech has beaten UVA 52.2% of the time in football. If we wanted to know the probability that VT wins at most 12 out of the next 15 games, would the normal approximation to the binomial be appropriate here? No, because 15 isn't enough games for the estimation to work. There's not enough information to tell. Yes, because we have met the criteria for the central limit theorem. Question 9 10 points X~bin(344, .82) Using the normal approximation, what is Pr[X at least 276]? .8212 .8023 .7823 .1788 Question 10 10 points X~bin(344, .82) Using the normal approximation, what is Pr[X < 270]? .0384 .0446 .0516 .4013...
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 Fall '07
 MELutz
 Statistics

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