21b review_decision_post

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University of California, San Diego *

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PSYC60

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Statistics

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Feb 20, 2024

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pdf

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In a random sample of 40 UCSD students, 15 prefer morning classes, 15 prefer afternoon classes, and 10 prefer evening classes. Test whether students in the population prefer certain times over others to have class? Use alpha = .01. What are the hypotheses? Ho : H 1 : What is the decision rule?
In a random sample of 40 UCSD students, 15 prefer morning classes, 15 prefer afternoon classes, and 10 prefer evening classes. Test whether students in the population prefer certain times over others to have class? Use alpha = .01. What are the hypotheses? Ho : P(M) = P(A) = P(E) = 1/3 H 1 : Ho is false What is the decision rule? Reject Ho at α = .01 and with C-1 = 3-1= 2 df if χ 2 ≥ 9.21.
Contra-ban sunglasses are advertised to block 90% of ultraviolet rays. You want to test your hunch that the actual proportion blocked it lower. In a sample of 25, the mean proportion of UV rays blocked was .84, with a standard deviation of .05. Alpha=.05. Ho: H1: DR :
Contra-ban sunglasses are advertised to block 90% of ultraviolet rays. You want to test your hunch that the actual proportion blocked it lower. In a sample of 25, the mean proportion of UV rays blocked was .84, with a standard deviation of .05. Alpha=.05. Ho: µ ≥ .90 H1: µ < .90 DR : At alpha = .05 and with n-1=24 df, reject Ho if t ≦ -1.71.
A sample of democrats and republicans were asked whether they think some hypothetical president obstructed justice. Twenty-five democrats said yes, and 37 democrats said no. Among republicans, 35 said yes and 27 said no. Test whether opinion about the president depends on political party? Alpha = .05. What are the hypotheses? Ho : H 1 : What is the decision rule?
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