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Question 9 Let X1,..., X30 be independent and identically distributed exponential random variables with mean 1. Calculate the probability that \bar{X} is greater than 1.1. ? 35% ? 29% ? 71% 5 pts Question 10 5 pts At a certain hospital a doctor wanted to calculate a confidence interval for the birth weights of new born babies that are born pre term to determine if their birth weights are lower. From hospital records it is determined that the population standard deviation of birth weights of babies is 1.8 lbs. A random sample of N=36 pre term babies is taken and it is found that the sample mean birth weight is 5.4 lbs. Construct a 90% confidence interval for the mean weight of pre term new born babies. ? (5.01,5.78) ? (4.8,5.99) ? (4.9,5.9)

          Question 9
Let X1,..., X30 be independent and identically distributed exponential random variables with
mean 1. Calculate the probability that \bar{X} is greater than 1.1.
? 35%
? 29%
? 71%
5 pts
Question 10
5 pts
At a certain hospital a doctor wanted to calculate a confidence interval for the birth weights of new
born babies that are born pre term to determine if their birth weights are lower. From hospital
records it is determined that the population standard deviation of birth weights of babies is 1.8 lbs. A
random sample of N=36 pre term babies is taken and it is found that the sample mean birth weight is
5.4 lbs. Construct a 90% confidence interval for the mean weight of pre term new born babies.
? (5.01,5.78)
? (4.8,5.99)
? (4.9,5.9)

Question 9
Let X1,..., X30 be independent and identically distributed exponential random variables with
mean 1. Calculate the probability that X̅ is greater than 1.1.
? 35%
? 29%
? 71%
5 pts
Question 10
5 pts
At a certain hospital a doctor wanted to calculate a confidence interval for the birth weights of new
born babies that are born pre term to determine if their birth weights are lower. From hospital
records it is determined that the population standard deviation of birth weights of babies is 1.8 lbs. A
random sample of N=36 pre term babies is taken and it is found that the sample mean birth weight is
5.4 lbs. Construct a 90% confidence interval for the mean weight of pre term new born babies.
? (5.01,5.78)
? (4.8,5.99)
? (4.9,5.9)

Added by Jaime N.

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