exam2 - IE 121 Spring 2002 Midterm exam 2 1. (15 points) In...

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IE 121 – Spring 2002 Midterm exam 2 1. (15 points) In this problem, you need to select the correct answer. 1. The null hypothesis is H 0 : μ = μ 0 , and the variance of the population is known. Which test statistic has to be used for the hypothesis testing? a) z 0 b) t 0 c) χ 2 0 2. Let L 95 be the length of the 95% confidence interval for a certain mean. Let L 90 be the length of the 90% confidence interval for the same mean. Which of the following statements is true? a) L 95 > L 90 b) L 95 < L 90 c) L 95 = L 90 3. Suppose we want to test the null hypothesis on the population pro- portion H 0 : p = p 0 against the alternative one H 1 : p > p 0 at the significance level α . Which of the following is the correct rejection cri- terion? a) | z 0 | > z α/ 2 b) z 0 > z α c) z 0 < - z α d) z 0 > z α/ 2 4. When the number of degrees of freedom of the t distribution is very large, it becomes: a) a normal distribution with mean 0 and variance 2 b) a χ 2 distribution c) the standard normal distribution
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This test prep was uploaded on 02/26/2008 for the course IE 121 taught by Professor Perevalov during the Spring '08 term at Lehigh University .

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exam2 - IE 121 Spring 2002 Midterm exam 2 1. (15 points) In...

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