A tree nursery has been experimenting with fertilizer to increase the growth of seedlings. A sample of 35 two- year-old pine trees are 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 are grown for three more years under identical conditions (soil, temperature, water) as the first group, but not fertilized. Tree growth is measured over the three- year period with the following results. keep track "in their head" while 216 of the accountants do so. Using a 1% level of significance, what does the business researcher find?