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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?
Test to determine whether the correlation in the population is zero, versus the alternate hypothesis that the correlation is greater than zero. Use the 0.05 significance level.
suppose the current price of gold is 930ounce. suppose also that the price 1 month from today has a normal distribution
a random sample of 70 needles was taken from a medical manufacturing facility and 24 were found to be defective.
Let X1,..., Xn be a random sample from a normal population. A particular realization resulted in a sample mean of 20 with the sample standard deviation 4. Construct a 95% con?dence interval for μ when:
The level of significance indicates the probability of rejecting a false null hypothesis.
In this problem set you will get some practice performing hypothesis tests for two samples. If you use Statdisk to perform any portion of these analyses, please include the results, label them, and refer to them accordingly in your interpretations..
six second-graders tried tossing a ball into a basket ten times each. their teacher then suggested a different way of
the time to failure in years for a product has the following pdfft 200t 103 for tgt0a derive the reliability function
How much net revenue does the state expect, on average from each ticket? What is the risk preference of people who play this lottery?
1.The following profit payoff table was presented in Problem.
At 5% level of significance, does this sample prove violation of guideline that average patient must pay no more than $250 out of pocket?
Suppose I have an experiment with 5 groups and 5 DVs and intend to conduct MANOVA to determine if there are mean differences between groups,
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