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Dyfyniad Arddull ChicagoLind, Douglas A. Statistical Techniques in Business & Economics. Boston: McGraw-Hill/Irwin, 2008.
Dyfyniad MLALind, Douglas A. Statistical Techniques in Business & Economics. Boston: McGraw-Hill/Irwin, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.