# An ecologist needs to test differences in the abundance of algal biomass 
# between the northern and southern sides of lakes. Fifteen freshwater lakes 
# were used and algal biomass is measured for the northern and southern sides
# in each lake
Lake	Site	Biomass
1	North	10
1	South	20
2	North	12
2	South	24
3	North	13
3	South	25
4	North	12
4	South	30
5	North	15
5	South	21
6	North	20
6	South	24
7	North	17
7	South	21
8	North	11
8	South	21
9	North	19
9	South	25
10	North	17
10	South	30
11	North	14
11	South	24
12	North	16
12	South	29
13	North	19
13	South	22
14	North	12
14	South	29
15	North	10
15	South	23