Sample sizes (draft)
Saturday, March 31st, 2007
Currently TrueDelta publicly posts Vehicle Reliability Survey results when there have been responses for at least 20 vehicles owned for at least 80 total months. In comparison, Consumer Reports’ minimum sample is 100 vehicles, with no minimum number of months of ownership. One hundred sounds a lot more impressive than 20. And they do love to brag about the size of their sample. But 20 is far more sufficient for what we’re doing than 100 is for what they do.