A researcher hypothesizes that electrical stimulation of the lateral habenula wi
ID: 3222542 • Letter: A
Question
A researcher hypothesizes that electrical stimulation of the lateral habenula will result in a decrease in food intake (in this case, chocolate chips) in rats. Rats undergo stereotaxic surgery and an electrode is implanted in the right lateral habenula. Following a ten day recovery period, rats (kept at 80 percent body weight) are tested for the number of chocolate chips consumed during a 10 minute period of time both with and without electrical stimulation. The testing conditions are counter balanced. Compute the appropriate t-test for the data provided below. (25 points)
Stimulation
No Stimulation
12
8
7
7
3
4
11
14
8
6
5
7
14
12
7
5
9
5
10
8
What would be the null hypothesis in this study?
What would be the alternate hypothesis?
Test the normality assumption. What is the conclusion about this assumption?
Test the homogeneity of the variance assumption. What is the conclusion about this assumption?
Is there a significant difference between the two testing conditions? Interpret your answer.
-Please attach all original and final SPSS output
Stimulation
No Stimulation
12
8
7
7
3
4
11
14
8
6
5
7
14
12
7
5
9
5
10
8
Explanation / Answer
a> Null hypothesis: Electrical stimulation of the lateral habenula has NO impact on food intake; the intake of chocolate chips will NOT be affected by the stimulation. i.e. the mean of the difference between the two experiments is 0.
b> Alternate hypothesis: Electrical stimulation of the lateral habenula has impact on food intake; the intake of chocolate chips will be affected by the stimulation. i.e. the mean of the difference between the two experiments is less than 0.
c> For normality
Hence the normality assumption is valid for the two experiments.
d> For verifying the homogenety of variance :
The p-value of >0.5, i.e. greater than the general assumed significance level. Hence the variances can be assumed to be similar.
e>
Overall:
t-test results from R:
e> The conditions seem identical for both the experiments.
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