In an agricultural test, each of four organic compounds is applied to a sample of plants. At the end of 4 weeks, the heights of the plants are as shown here. At the 0.025 level, are the compounds equally effective in promoting plant growth?
|
Formula 1:
|
19
|
18
|
20
|
20
|
18
|
Inches
|
|
Formula 2:
|
9
|
13
|
20
|
16
|
13
|
18
|
|
Formula 3:
|
14
|
8
|
8
|
17
|
8
|
|
|
Formula 4:
|
10
|
13
|
12
|
19
|
18
|
11
|