What type of samples are these?Dependent samplesVariancesProportionsIndependent Samples

10. Engine Wear To compare the wearing of two types of automobile engines, I and 2, an experimenter chose to "pair" the points measurements, comparing the wear for the two types of engines on each of 7 automobiles, as shown below. 15 Automobile 1 2 5 6 7 Engine 1 8 15 10 13 11 Engine 2 12 18 12 11 10 Estimate with 90% confidence the mean difference and interpret