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:

2. A researcher wanted to determine the extent to which Tylenol PM influenced people’s reaction times. He had 10 participants complete a reaction time measure (higher scores mean slower responses) before taking Tylenol PM and then again one hour after they had taken the drug. Was there a significantly difference in their reaction time?

Pre Test	Post Test
100	125
78	85
89	90
110	150
80	90
95	99
87	87
100	150
75	80
88	100

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