Stat 215 Quiz 11

Stat 215 Quiz 11 - significant decrease in liberalism. Your...

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Stat 215 Quiz 11 Module: Quiz , Exercise: HypTest_p1_p2(A) Question First year college students were asked their polical orientation in 1970 and 1980. In 1970, 190 out of 500 replied that they were liberal/far left, whereas 125 out of 500 responded that they were liberal/far left in 1980. Is there a signicant decrease in the percentage from 1970 to 1980. Answer Null: p(1970) = p(1980) Alt: p(1970) > p(1980) Z = (0.38 - 0.25)/sqrt(0.315 X 0.685 X 0.004) = 0.13/0.029379 = 4.425 P-value = P(Z > 4.425) < 0.001, Reject the null and conclude that there is a
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Unformatted text preview: significant decrease in liberalism. Your Answer Ho: p1=p2 H1: p1&lt; 1980. to 1970 from percentages the in difference signficant a is there and accepted H1 Therefore rejected. Ho region, rection Zobs=&quot;(.38-.25)/&quot; Since 500)=&quot;4.42&quot; (2*(.315*1-.315) sqrt p^=&quot;(190+125)/500&quot; 0.25 p^2=&quot;125/500=&quot; 0.38 p^1=&quot;190/500=&quot; Z=&quot;1.645&quot; so alpha=&quot;0.05&quot; assume Level Sig&gt; Grader Comments (none) Grade 10.0 (out of 10.0) Total 10.0 (out of 10.0)...
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This note was uploaded on 04/03/2008 for the course STAT 215 taught by Professor Dr. during the Spring '08 term at WVU.

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