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Quiz2b_KEY_Sp11

# Quiz2b_KEY_Sp11 - Name_KEY 4 February 2011 IE330 Spring...

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Name: ___________KEY_________________________________ 4 February 2011 IE330 Spring 2011 Quiz #2b Confidence intervals ( 29 ( 29 2 2 2 /2 /2, 1 /2 2 2 /2, 1 1 /2, 1 1 1 ˆ ˆ (1- ) ˆ / n / n n n n n s n s p p x z x t s p z n α α α α α σ σ - - - - - - ± ± ± Χ Χ Single sample tests ( 29 0 2 2 0 0 0 0 0 0 2 0 0 0 1 / / (1 ) n S X X X np Z T Z n s n np p μ μ χ σ σ - - - - = = = = - 1

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Name: ___________KEY_________________________________ 3

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Name: ___________KEY_________________________________ 1. (10 points) In order to use /2 / n x z α σ ± to compute a confidence interval on an estimate of mean, which of the following must be true (select all that are true)? a. The observations in the sample must be IID. b. You must know the mean of the sample. c. You must know the variance of the population. d. None of the above is true. 2. (10 points) ( TRUE or FALSE) All else being equal, a 95% confidence interval will be wider than a 90% confidence interval. 3. (10 points) The t-table allows you to identify values corresponding to an integration of what type of distribution? ( Note : Either just d or both c and d are acceptable. The “infinity” line of the t-table shows the standard normal
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