Quiz2a_KEY_Sp11

Quiz2a_KEY_Sp11 - Name_KEY 4 February 2011 IE330 Spring...

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Name: ________________KEY____________________________ 4 February 2011 IE330 Spring 2011 Quiz #2a 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____________________________ 2
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Name: ________________KEY____________________________ 3
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Name: ________________KEY____________________________ 1. (10 points) (TRUE or FALSE) All else being equal, a confidence interval computed from a sample with more observations will be wider than one computed from a sample with fewer observations. 2. (10 points) The z-table allows you to identify values corresponding to an integration of what type of distribution? a. Standard normal b. Normal c. Chi-squared d. Binomial e. None of the above 3. (10 points) In order to use /2, 1 / n n x t s α - ± to compute a confidence interval on an estimate of mean, which of the following must be true (select all that are true)? a. You must know the standard deviation of the population. b. You must know the number of observations in the sample.
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