Practice_Exam_II_no_multiple_choice

Practice_Exam_II_no_multiple_choice - Exam Name_ SHORT...

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Exam Name___________________________________ SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Solve the problem. 1) Consider the probability distribution shown here. x 6 8 1 0 p(x) 1 3 1 3 1 3 Let s 2 be the sample variance for a random sample of n = 2 measurements from this distribution. Show that s 2 is an unbiased estimator for s 2 . 1) 2) Consider the population described by the following probability. x 22 24 26 P(x) .5 .3 .2 The random variable x is observed twice. Consider the observations to be independent and fill out the following table for the sampling distribution of the sample mean _ x. _ x Probability 2) 3) The weight of corn chips dispensed into a 10-ounce bag by the dispensing machine has been identified as possessing a normal distribution with a mean of 10.5 ounces and a standard deviation of .2 ounces. Suppose 100 bags of chips were randomly selected from this dispensing machine. Find the probability that the sample mean weight of these 100 bags exceeded 10.45 ounces. 3) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 4) Which piece of information listed below does the Central Limit Theorem allow us to disregard when working with the sampling distribution of the sample mean? A) The standard deviation of the population B) The shape of the population distribution curve C) The mean of the population D) All can be disregarded when the Central Limit Theorem is used. 4) 1
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SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 5) A university is considering a change in the way students pay for their education. Presently, the students pay $16 per credit hour. The university is contemplating charging each student a set fee of $240 per quarter, regardless of how many credit hours each takes. To see if this proposal would be economically feasible, the university would like to know how many credit hours, on the average, each student takes per quarter. A random sample of 250 students yields a mean of 14.5 credit hours per quarter and a standard deviation of
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This note was uploaded on 07/11/2008 for the course ECON V31.0018 taught by Professor Hall during the Summer '08 term at NYU.

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Practice_Exam_II_no_multiple_choice - Exam Name_ SHORT...

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