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Effects of Alcohol A researcher has recruited 20
Chapter 1, Problem 22E(choose chapter or problem)
Problem 22E
Effects of Alcohol A researcher has recruited 20 volunteers to participate in a study. The researcher wishes to measure the effect of alcohol on an individual’s reaction time. The 20 volunteers are randomly divided into two groups. Group 1 serves as a control group in which participants drink four 1-ounce cups of a liquid that looks, smells, and tastes like alcohol in 15-minute increments. Group 2 will serve as an experimental group in which participants drink four 1-ounce cups of 80-proof alcohol in 15-minute increments. After drinking the last 1-ounce cup, the participants sit for 20 minutes. After the 20-minute resting period, the reaction time to a stimulus is measured.
(a) What type of experimental design is this?
(b) Use Table I in Appendix A or a random-number generator to
divide the 20 volunteers into groups 1 and 2 by assigning the
volunteers a number between 1 and 20. Then randomly select
10 numbers between 1 and 20. The individuals corresponding
to these numbers will go into group 1.
Questions & Answers
QUESTION:
Problem 22E
Effects of Alcohol A researcher has recruited 20 volunteers to participate in a study. The researcher wishes to measure the effect of alcohol on an individual’s reaction time. The 20 volunteers are randomly divided into two groups. Group 1 serves as a control group in which participants drink four 1-ounce cups of a liquid that looks, smells, and tastes like alcohol in 15-minute increments. Group 2 will serve as an experimental group in which participants drink four 1-ounce cups of 80-proof alcohol in 15-minute increments. After drinking the last 1-ounce cup, the participants sit for 20 minutes. After the 20-minute resting period, the reaction time to a stimulus is measured.
(a) What type of experimental design is this?
(b) Use Table I in Appendix A or a random-number generator to
divide the 20 volunteers into groups 1 and 2 by assigning the
volunteers a number between 1 and 20. Then randomly select
10 numbers between 1 and 20. The individuals corresponding
to these numbers will go into group 1.
ANSWER:Answer
Step 1 of 2
(a)
A researcher has recruited 20 volunteers to participate in a study.
The 20 volunteers are randomly divided into two groups.
Group 1 serves as a control group and group 2 will serve as an experimental group.
We are asked to find the type of experiment design.
The type of experiment design is completely randomized design since each experimental unit is randomly assigned to a treatment.