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. Stimulation No Stimulation 12 8 7 7 3 4 11 14 8 6 5 7 14 12 7 5 9 5 10 8 What probability level did you choose and why? What were your degrees of freedom? Is there a significant difference between the two testing conditions? Interpret your answer. If you have made an error, would it be a Type I or a Type II error? Explain your answer.
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.
Stimulation No Stimulation
12 8
7 7
3 4
11 14
8 6
5 7
14 12
7 5
9 5
10 8
What probability level did you choose and why?
What were your degrees of freedom?
Is there a significant difference between the two testing conditions?
Interpret your answer.
If you have made an error, would it be a Type I or a Type II error? Explain your
answer.
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