A tree nursery has been experimenting with fertilizer to increase the growth of seedlings. A sample of 35 two-year-old pine trees is grown for three more years with a cake of fertilizer buried in the soil near the trees’ roots. A second sample of 35 two-year-old pine trees is grown for three more years under identical conditions (soil, temperature, water) to the first group, but not fertilized. Tree growth is measured over the three-year period with the following results.

Transcribed Image Text:

Trees with Fertilizer Trees without Fertilizer n₁ = 35 X₁ = 97.5 cm %₁ = 24.9 cm m₂ = 35 X₂ = 58.7 cm 0₂= 18.8 cm