Question

1. It is known that the effect of giving amphetamine after brain damage is to reduce tissue necrosis

(death). A researcher is interested in whether this effect translates into better behavioral performance.

The researcher lesions the brains of a group of 9 rats with a chemical injected into their motor cortex to

simulate a stroke. The researcher then randomly assigns rats to one of 3 conditions. In Condition A, the

rats are given no other treatment. In Condition B, the rats are given a saline solution intravenously

immediately after the lesion. In Condition C, the rats are given amphetamine intravenously immediately

after the lesion. The researcher then measures how long each rat can maintain balance on a thin bar

before falling off 2 days later. The following data are obtained (all times are in seconds):

Rat , Condition(A,B,C), Time

1, A, 8

2, A, 6

3, A, 10

4, B, 12

5, B, 10

6, B, 7

7, C, 18

8, C, 21

9, C, 20

A) What is the DV? __________ What is the IV?

B) What analysis should be used to determine if there is a difference in

balancing time as a function of treatment?

C) What is the result of that analysis?

D) Given that result, can we conclude amphetamine caused a difference in

balancing time? If so, what was the change (i.e., did amphetamine reduce

or increase balancing time)?

E) Given the result of the test, can we conclude that amphetamine does

not cause a change in balancing time? If so, explain how. If not, expla

Answer 1

A. The DV is behavioural performance. The IV is amphetamine dosage.
B. A one way ANOVA should be used.
C. The F-statistic value = 28.28988.
D. The results above are statistically significant. We can therefore conclude that amphetamine caused a difference in balancing time.

Please post the other questions separately as we are supposed to answer just one question or four sub parts of the same question.