A consumer research group tested the battery life of two different smartphone models, Model X and Model Y. For Model X, the estimated average battery life was 25 hours with a margin of error of 2 hours. For Model Y, the estimated average battery life was 28 hours with a margin of error of 1 hour. Based on these estimates, which of the following is the most appropriate conclusion?
Model X definitely has a shorter average battery life than Model Y.
Model Y definitely has a longer average battery life than Model X.
There is no statistically significant difference between the average battery lives of Model X and Model Y.
The average battery life of Model X is exactly 25 hours, and Model Y is exactly 28 hours.
