Stat 231 Exam 2 F10

# Stat 231 Exam 2 F10 - Stat 231 Exam 2 Fall 2010 I have...

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1 Stat 231 Exam 2 Fall 2010 I have neither given nor received unauthorized assistance on this exam. ________________________________________________________ Name Signed Date _________________________________________________________ Name Printed

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2 1. Below are 5 histograms and 5 normal plots. Each normal plot was in fact made from one of the data sets that produced the histograms. Match normal plots to histograms by writing a single letter beside each histogram that you believe corresponds to the normal plot for that histogram. 10 pts
3 2. The number of calls reaching a call center in a 1-minute period is reasonably modeled as Poisson with mean 2 . Use the central limit theorem and approximate the probability that in the next hour at least 100 calls total reach the call center. (You should treat the 60 1-minute periods as independent.) 3. A pre-election poll is based on a "random sample of 1000 n likely voters" (nevermind the issue of how one could ever possibly obtain such a sample!). 547 of those polled express a

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Stat 231 Exam 2 F10 - Stat 231 Exam 2 Fall 2010 I have...

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