A group of 30 participants is divided in half based on their self-rating of the vividness of their visual imagery. Each participant is tested on how many colors of objects they can correctly recall from a briefly seen display. The results of this experiment are below:
Vivid Less Vivid
18 14
17 12
16 13
15 10
14 8
13 8
9 7
8 6
7 5
6 4
5 3
11 2
13 5
18 11
18 14
a. Enter the data into Minitab and perform a two-group t-test of the null hypothesis that vividness of visual imagery does not affect the recall of colors; use alpha = .01, two-tailed. Hint: .01 is not the default alpha level. What is your statistical conclusion?