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| Teaching Since: | May 2017 |
| Last Sign in: | 398 Weeks Ago, 2 Days Ago |
| Questions Answered: | 66690 |
| Tutorials Posted: | 66688 |
MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
5.28 In a study conducted at Virginia Tech on the development of ectomycorrhizal, a symbiotic relation- ship between the roots of trees and a fungus, in which minerals are transferred from the fungus to the trees and sugars from the trees to the fungus, 20 northern red oak seedlings exposed to the fungus Pisolithus tinc- torus were grown in a greenhouse. All seedlings were planted in the same type of soil and received the same amount of sunshine and water. Half received no ni-
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trogen at planting time, to serve as a control, and the other half received 368 ppm of nitrogen in the form NaNO3. The stem weights, in grams, at the end of 140 days were recorded as follows:
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Brand A: Brand B:
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x¯1= 36,300 kilometers, s1 = 5000 kilometers.x¯2= 38,100 kilometers, s2 = 6100 kilometers.
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0.32 0.26
0.53 0.43
0.28 0.47
0.37 0.49
0.47 0.52
0.43 0.75
0.36 0.79
0.42 0.86
0.38 0.62
0.43 0.46
Construct a 95% con?dence interval for the di?erence in the mean stem weight between seedlings that re- ceive no nitrogen and those that receive 368 ppm of nitrogen. Assume the populations to be normally dis- tributed with equal variances.
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