Question

"A psychologist is interested in whether hypnosis affects brain dominance (that is, whether the left or right hemisphere of the brain is dominant). Eleven college students from the freshman class are randomly sampled for an experiment. The experiment has two conditions that are given on different days. In condition 1, the students are hypnotized and then given a test that measures the relative dominance of the right and left hemispheres. The higher the score, the more dominant is the right hemisphere. In condition 2, the same students are given the test again, only this time they are not hypnotized but are in their normal state of consciousness. The following scores are obtained:

Student	1	2	3	4	5	6	7	8	9	10	11
Condition 1	26	15	22	19	23	37	16	17	14	16	21
Condition 2	12	13	18	17	21	22	18	22	10	14	15

What is the p value? In other words, what is the probability of getting a result as extreme or more extreme as the observed result purely by chance (2-tailed)?" Show your work.

Answer 1

We have to find the p-value.

By using the TI-84 calculator we have to find p-value easily.

Click on STAT---------> Edit ---------> Enter condition1 values into L1 and condition2 values into L2.

Then click on STAT --------> TESTS --------> 2-SampTTest -------->Data --------->

List1: L1

List2: L2

Freq1:1

Freq2:1

Pooled: Yes

Calculate

We get

Test statistic = t = 1.70

P-value = 0.1042

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