solution6 - Stat 350 (Spring 2011) Solution 6 Samantha, I...

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Stat 350 (Spring 2011) Solution 6 Samantha, I told the class to use the simplified formula for CIs of population proportion: p ± z * p (1 p ) n I did not calculate the exact numerical values for the homeowork. As long as they have the correct Z* critical values and their numerical answers are close to what the answers in the solution manual below, please count them correct. Section 7.3 21. Here, n = 356, and . With 95% confidence, we use the value for a two‐sided confidence interval: Or p ± z * p (1 p ) n = 0.565 ± (1.96)* 0.565(1 0.565) 356 22. In this problem, we have and . For a two‐sided 99% confidence interval, we use : Or p ± z * p (1 p ) n = 0.28 ± (2.576)* 0.28*(1 0.28) 507
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23. Here, we have and . For a 95% lower confidence bound, we use the value of : lower bound is .217. We are 95% confident that at least 21.7% of all households in this Midwestern city own firearms. 24.
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This note was uploaded on 02/06/2012 for the course STAT 350 taught by Professor Staff during the Spring '08 term at Purdue University.

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solution6 - Stat 350 (Spring 2011) Solution 6 Samantha, I...

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