An administrator finds in a local study that 42% of his universitys students obtain an undergraduate degree in 4 years of study (based on 400 randomly selected students). Assuming that the national average for students graduating in 4 years is 39% and that the probability of observing this sample mean of 42% or higher was 0.039,what conclusioncan the administrator makeabout his universitys graduation rate?

The sample size is not large enough to draw any statistical conclusions.

There is enough evidence to conclude that it is lower than the national average.

There is enough evidence to conclude that it is higher than the national average.

There is not enough evidence to conclude that it is higher than the national average.