Twelve family pets have been randomly placed into two groups. Group 1 receives the standard version of a flea powder, while group 2 receives a modified formula. Four days following treatment, researchers count the number of fleas collected from each pet during a 2-minute period. The results are shown below. At the 0.025 level, is the new formula more effective than the old? 

Number of fleas after old formula:
17     16     17     4 8     15
Number of fleas after new formula:
6     1     1     2     7     5