An engineer designs an improved automobile engine for a certain make of automobi

Question

An engineer designs an improved automobile engine for a certain make of automobile. The previous design had an average highway gas mileage of 30 mph (miles per gallon). The new engine has an average highway gas mileage of 30.2 mpg, based on a sample of 3600 cars of the model with the new engine. Although the difference is quite small, the effect is statistically significant. The explanation is ______. Pick one answer from the following.

a. that new designs typically have less variability than standard designs, and so small differences can appear to be statistically significant.

b. that the sample size is very large.

c. that the mean of 30.2 is large compared to the gas mileage of most cars.

Explanation / Answer

that new designs typically have less variability than standard designs, and so small differences can appear to be statistically significant.

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