# statistics/psyc

posted by .

Researchers are interested in the effectiveness of a particular treatment for insomnia. Fifty insomnia sufferers who responded to a newspaper ad are contacted, and each is given a pill with instructions to take it before going to sleep that night. The pill actually contains milk powder (a placebo). The participants are randomly assigned to receive one of two sets of instructions about the pill. One half of the participants are told that the pill will make them feel "sleepy," and the other half are told that the pill will make them feel "awake and alert." The next day the participants return to the lab and are asked to indicate how long it took them to fall asleep after taking the pill. The individuals who were told that the pill would make them feel sleepy reported that they fell asleep faster than the participants who were told the pill would make them feel alert.

The assignment: (1�2 pages)

With the study in mind, please do the following:
Identify the independent and dependent variables. Indicate the number of levels in the independent variable and describe each level.
Indicate whether the research used a between-participants or a within-participants research design and explain how you concluded which type of design was used.
Suppose an ANOVA was conducted. Briefly explain in your own words what it would mean if the F was significant in this particular study.

• statistics/psyc -

When going to sleep, why would anyone want to take a pill that makes them feel "awake and alert"? I would also have a group that took no pill.

An independent variable is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable.

A dependent variable is the response or measure of results.

## Similar Questions

1. ### English

Analogies Yearn: longing which one fits with this?
2. ### statistics

Does lovastatin reduce the risk of heart attack?
3. ### biology/math

an advertisement for sleeping pills claims to cause 50% longer lasting sleep. you decide to compare this new pill to your original sleeping pill. subject (A) takes the origianl sleeping pill and subject (B) takes the new pill. subject …
4. ### statistics

1. A researcher is interested in comparing the effectiveness of three different kinds of therapy for anger problems. Eight participants are randomly assigned to three treatment conditions: Cognitive Therapy (CT), Cognitive-Behavioral …
5. ### biology

is insomnia the same thing as sleep deprivation. im pretty sure they are different but i just wanted to check. also what in the brain causes insomnia. What parts of the brain create it and what are the functions?
6. ### hysical edu

Roger is a single father of two young daughters and has been dating Cheryl for the past two years. He recently learned that his company is going to downsize. Although Roger is financially stable, he is worried that his job is in jeopardy. …
7. ### psych statistics

Martha believes that a relaxation technique involving visualization will help people with mild insomnia fall asleep faster. She randomly selects a sample of 20 participants from a group of mild insomnia patients and randomly assigns …
8. ### Health (Ms. Sue)

1. Describe what happens during NREM and REM sleep. A: In the beginning of a sleep cycle, we enter NREM sleep. The body recovers from the stress of the day's activities during this part of the sleep. Then, about 1.5 hours into sleep, …
9. ### Statistics

A researcher conducts a test on the effectiveness of a cholesterol treatment on 114 total subjects. Assuming the tails of distributions are normal distribution, is there evidence that the treatment is effective?