Two Sets
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 New Kids Electric Blue Piano Keyboard Black Guitar Musical Instrument Toy Set  US $51.95
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 M Audio Fast Track Pro w Pro Tools SE US $237.99
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 Maxam 41in ACOUSTIC GUITAR w BAG STRAP US $115.99
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 John Denver The Wildlife Concert Piano Vocal Guitar Book US $17.95
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 Korg KM202 Two Channel DJ MIXER US $152.50
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 8 PA DJ Pro Audio Band Speaker 75 W NEW Monitor Church US $49.99
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 Devi Ever Rocket Dual Fuzz Pedal US $110.00
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 Peavey QW215 Cabinets 1 Set of 2 Cabinets US $1,798.00
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 Set of TWO Sticks Xylophone Marimba Yamaha Model 22 Rattan Yarn Wrap US $4.25
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 Set of TWO Sticks Xylophone Marimba Yamaha MP 01 MH Stiff Wood Yarn Wrap US $3.50
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 Hagstrom HIIN OT Vintage Guitar 1971 or 1972 US $1,000.00
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 Valley Arts Brent Mason Telecaster US $1,350.00
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 Marshall MG4 MG30FX 10 30 watt Combo NO RESERVE US $51.00
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 Rare Old French Viola Labeled Jean Baptiste Vuillaume a Paris 15 1 2 US $3,799.00
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how to test the difference between two sets of numbers?
given two sets of numbers (eg stock returns), how would you test whether the difference in mean between the two sets is statistically significant, preferably using Excel? An example would be nice, thanks.
Compute the mean and standard deviation of the two sets, then set the Z-value based on the total variance of the two (std dev. of difference = sqrt(std dev 1^2 + std dev 2^2)). Then you have to set your acceptance threshhold (alpha), and do a reverseCDF lookup to determine if the difference between the means falls outside that range.
