A researcher conducted a study to investigate the effect of caffeine on work pro

Question

A researcher conducted a study to investigate the effect of caffeine on work productivity. He had 20 subjects complete math problems for 5 min. Then all 20 subjects drank two cups of coffee and completed math problems again for 5 min. The researcher believes that drinking the caffeine in the coffee will result in more problems solved in the 5 min period. Use this description for next 3 questions below. Q31. What statistical test should the researcher use to determine if caffeine helps people complete more math problems? O Dependent-samples t-test One-sample z-test O Independent-samples t-test One-sample t-test

Explanation / Answer

One sample z test will determine whether a population is significantly different from the hypothesis value and population variance is nown.Dependant sample t test compares whether there is a difference between two means.Independant sample test is the difference between two unrelated groups.One sample t test whether a population comes from a particular population or another group.One sample t test is used by the researcher

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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