A tree nursery has been experimenting with fertilizer to increase the growth of seedlings. A sample of
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A second sample of 35 two-year-old pine trees is 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.
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Do the data support the theory that the population of trees with the fertilizer grew significantly larger during the period in which they were fertilized than the non-fertilized trees? Use α =.01.
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