The makers of furnace filters recently conducted a test to determine whether the median number of particulates that would pass through their four leading filters was the same.A random sample of 6 of each type of filter was used with the following data being recorded: 
If the Kruskal-Wallis test is used,the critical value for an alpha = .05 is 7.814.
Definitions:
Present Value Index
A financial calculation that allows the comparison of the present value of cash inflows to the present value of cash outflows.
Rate of Return
A measure of the profitability of an investment, expressed as a percentage of the original investment.
Desired Rate
A targeted rate of return or performance that a company or individual aims to achieve, often used in financial and operational planning.
Present Value Methods
Techniques used to estimate the current value of future cash flows, discounting them at a specified rate.
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