A major oil company conducts an experiment to assess whether a film designed to

Question

A major oil company conducts an experiment to assess whether a film designed to tell the truth about, and also promote more favorable attitudes toward, large oil companies really does result in more favorable attitudes. Twelve individuals are run in a replicated measures design. In the "before" condition, each subject fills out a questionnaire designed to assess attitudes toward large oil companies. In the "after" condition, the subjects see the film, after which they fill out the questionnaire. The following scores were obtained. High scores indicate more favorable attitudes toward large oil companies.

Analyze the data using the Wilcoxon signed ranks test with = 0.051 tail. What do you conclude?

Before After 45 44 49 62 26 20 22 34 13 5 16 24 35 41 27 19 42 56 30 33 32 42 10 22

Explanation / Answer

We can solve this quesion using R software.

R codes and output.

So Tobt = 16.5

Degrees of freedom = n - 1 = 12 - 1 = 11

Tcrit = 2.19

Tobt > Tcrit so before and after data have same population.

Tcrit

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.