R. Stichler et al. compared two methods of measuring treadwear
in a paper. Eleven tires were each measured for treadwear by two
methods: one based on weight, and the other on groove wear. The
data, in thousands of miles, are in the table. Use the paired
?-test to answer the following: at the 5% significance level, do
the data provide sufficient evidence to conclude that, on average,
the two measurement methods give different results?
Weight Method ------------------- Groove Method
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