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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< 1980. to 1970 from percentages the in difference signficant a is there and accepted H1 Therefore rejected. Ho region, rection Zobs="(.38-.25)/" Since 500)="4.42" (2*(.315*1-.315) sqrt p^="(190+125)/500" 0.25 p^2="125/500=" 0.38 p^1="190/500=" Z="1.645" so alpha="0.05" assume Level Sig> Grader Comments (none) Grade 10.0 (out of 10.0) Total 10.0 (out of 10.0)...
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