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View Full Version : 7 step Hypothesis testing, yikes!



Benjidats
04-16-2012, 07:08 AM
1.) A scientist is testing the effect of a new allergy medication on reaction time. A sample of n=16 students is obtained and every student has the normal dose of medicine. 30 min later, each students reaction time is measured. The scores for the sample averaged M=220 milliseconds with SS= 6000.
Assuming the reaction time for students in the regular population averages mu=200 milliseconds, are the data sufficiently conclude the medication has a significant effect on reation time?

Step 1: State the hypothesis
Step 2: State the alpha level and reaso for selecting it
Step 3: Indicate which statistic you have selected
Step 4: Indicate which distribution will be used, displaying df and critical values
Step 5: State the rejection rule
Step 6: Perform the calculations (included t-stat here)
Step 7: State your decision in terms of hypothesis


These two next questions need to answered with the same 7 steps above:

2.) A scientist researches the role of serotonin in aggression. One sample rats serves as a control group and received a placebo. A second sample rats receive a drug that lowers brain levels of serotonin. Then the researcher tests the rate by recording the number of aggressive responses each of the rats show. Does the drug have a signficant effect on aggression? The data is below.

Low serotonin Control
n=6 n=8
M=22 M=14
SS=108. SS=180


3.) A scientist tests relaxation training and if it will affect the number of headaches of chronic headache sufferers. For a week before training, every patient records the number of headaches suffered. Subjects then receive relaxation training and for the week following training the number of headaches again measured. The change in never of heaches before an after training is as follows(minus signs indicate a reduction):