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Carbon dioxide and plant growth. The concentration of carbon dioxide (CO2) in the atmosphere is increasing rapidly due to our use of fossil fuels. Because plants use CO2 to fuel photosynthesis, more CO2 may cause trees and other plants to grow faster. An elaborate apparatus allows researchers to pipe extra CO2 to a 30-meter circle of forest. They set up three pairs of circles in different parts of a forest in North Carolina.One of each pair received extra CO2 for an entire growing season, and the other received ambient air. The response variable is the average growth in base area for trees in a circle, as a fraction of the starting area. Here are the data for one growing season:
(a) Summarize the data. Does it appear that growth was faster in the treated plots?
(b) The researchers used a matched pairs t test to see if the data give good evidence of faster growth in the treated plots. State hypotheses, carry out the median increase in heart rate and apply the Wilcoxon signed rank test. What do you conclude?
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
as a counselor in the field of addiction you are interested in researching if online gambling is becoming more
The major shopping areas in community of Springdale include Springdale Mall, West Mall, and downtown area on Main Street. A telephone survey has been conducted to determine strengths and weaknesses of these areas and to find out how they fit in th..
determine the total area under the standard normal curve in parts a through c below. a find the area under the normal
Get an answer from tutors to this homework question now: Under what circumstances is the experimentwise alpha level a concern?
How many citizens would need to be sampled if a 99% confidence interval was desired to estimate the true proportion to within 1%?
As of 12-31-13, G owned several limited-life intangible assets. During 2014, G purchased an unlimited-life intangible asset for $60,000.
Can people really identify their favorite brand of cola? Volunteer tasted coca-cola classic, pepsi, Diet coke, and Diet pepsi, with the results shown below.
The formula h(s) = -32s2 + 400s + 8 models a rocket's height, h, in feet, s seconds after launching. Find the height, h(s), five seconds after launch.
Construct a box plot for the TIPRATE - What is the relationship between tips (TIP) and the total bill (TOTBILL) and what does the evidence indicate? Is there a tendency for customers to give "generous" or "cheap" tips relative to the total bill?
What is the minimum sample size required to assure that your sample proportion "p" will be within the required margin of error around the population proportion "p". Use the traditional methods for testing hypotheses and show the results of all ste..
The time to failure of a nickel-cadmium battery is Weibull-distributed with parameters v=0 α = 1/2 years and β = 1/4. Find the fraction of batteries that are expected to fail prior to 1.5 years.
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