7-5) A researcher intends to determine if exposure to a documentary about death penalty would impact...

7-5) A researcher intends to determine if exposure to a documentary about death penalty would impact attitudes toward capital punishment. From a large class of undergraduate students she selects a random sample of 40 students who will watch the movie [experimental group] and a random sample of 40 students [control group] who will not watch the documentary. She then measures one’s opposition toward penalty using a single-item question asking students to rank their opinions on a scale from zero [strong support for death penalty] to six [strong opposition]. The table below presents the summary results of her experiment:

N Mean Std. dev.

Experimental group 40 4.0 2

Control group 40 3.0 1.5

a. Formulate the null hypothesis

b. Formulate the alternative hypothesis

c. Using the independent-sample t test, test the null hypothesis [H0]

d. List the value of the critical t you used to test H0 [df = n1 + n2 – 2; p = .05; 2-tail test]

e. Reach a statistical conclusion using p = .05, 2-tail test, and the appropriate df

f. Interpret your results. In your opinion did the documentary had an effect or not? Explain.

Expert Solution

orchestra answered 2 years ago

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