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Quiz2c_KEY_Sp11

# Quiz2c_KEY_Sp11 - Name_KEY 4 February 2011 IE330 Spring...

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Name: _______________KEY_____________________________ 4 February 2011 IE330 Spring 2011 Quiz #2c 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_____________________________ 1. (10 points) The t-table allows you to identify values corresponding to an integration of what type of distribution? ( Note: Either just d or c and d are acceptable. The “infinity” row of the t-table shows the integration results for the standard normal distribution. ) a. Normal b. Chi-squared c. Standard normal d. A t-distribution e. None of the above 2. (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. You must know the standard deviation of the sample. b. You must know the size of the population. c. You must know number of observations in the sample. d. None of the above is true. 3. (10 points) (TRUE or
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Quiz2c_KEY_Sp11 - Name_KEY 4 February 2011 IE330 Spring...

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