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Laureysens,et al.(2004) studied the concentration of aluminum in wood from a number of clones of poplar growing in an area with heavy pollution.The same clone was sampled and tested once in August and again in November.The researchers believed that the concentration of aluminum would be shown to be increasing over time and hence higher in November than in August.The following table gives the aluminum concentrations for twelve of the clones. The data are to be analyzed using the Wilcoxon signed rank test.The null hypothesis they established was that the values of aluminum concentrations in the 2 months have the same distribution.Under the null hypothesis,what are the values of the mean and standard deviation,respectively,of the statistic W+?
Roth Retirement Plan
A retirement savings plan allowing a person to contribute after-tax income, with withdrawals being tax-free under certain conditions.
Tax Withdrawals
Payments or deductions from earnings or income which are removed by the government as taxation.
Income Tax Code
The body of laws and regulations that govern how individuals, corporations, and other entities are taxed on their income.
Progressive
Often refers to a system or policy where the rate increases as the taxable amount increases, commonly applied to taxes and social policies.
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