Question

1. A psychologist was interested in the effect of Vitamin A deficiency on maze learning rats. A group of nine rats learned a simple maze. Next, these same rats were deprived of Vitamin A for six weeks and were then tested again on their ability to learn a second maze equal in difficulty to the first. The scores represent the number of maze errors made under the two treatment conditions.

Pre-test	Post-test
17	13
18	23
19	18
10	19
22	22
21	26
15	18
18	13
19	29

Perform an appropriate two-tailed test of the significance of the mean difference.

Hypotheses:                      

t _obs=                         

t_crit=                               

df =                        

Mean difference =  

Experimental conclusion (Write out):

Find the 95% CI for this data:

Answer 1

from above:

t obs =-1.373

tcrit = -/+ 2.306

df =8

Mean difference =-2.444

Experimental conclusion:as test statistic is not in rejection region we can not conclude that there is a significant difference in mean score between pre and post test

95% CI =-6.550 ; 1.661