A researcher wants to determine if there is a significant difference between the Picture Arrangement scores (a subtest of the WAIS IV that some feel may tap right-brain processing powers) between groups of right- and left-handed college students. Calculate a two-tail t ratio between their scores:

Left-Handed: 12, 10, 12, 14, 12, 10, 8.

Right-Handed: 8, 10, 10, 12, 11, 6, 7.

a. Do you reject the null hypothesis?

b. Is there a significant difference in the Picture Arrangement scores between the right- and left-handed students?

c. What type of research is this, post facto or experimental?

d. Identify both the IV and DV.