Two types of fish attractors, one made from vitrified clay pipes and the other from cement blocks and brush, were used during 16 different time periods spanning 4 years at Lake Tohopekaliga, Florida. The following observations are of fish caught per fishing day.

Period Pipe Brush Diff.
1 0.20 0.48 -0.28
2 2.00 2.33 -0.33
3 5.06 5.38 -0.32
4 0.78 0.79 -0.01
5 0.57 0.32 0.25
6 0.52 0.76 -0.24
7 0.31 0.52 -0.21
8 0.43 0.91 -0.48
9 0.49 0.75 -0.26
10 1.05 1.61 -0.56
11 5.94 6.53 -0.59
12 0.77 0.83 -0.06
13 2.03 2.17 -0.14
14 8.09 8.21 -0.12
15 0.83 0.56 0.27
16 0.62 0.75 -0.13

Using these data apply the appropriate method for a Hypothesis Test to determine if one attractor appears to be more effective on average than the other? Use an .05 level of significance.