Question: (6 points) A researcher was interested in estimating whether younger college students got enough sleep. He asked 28 randomly selected college students how many hours of sleep they got on a "typical" evening. The average amount of sleep for those sampled was 6.7223 hours per night, and the standard deviation for the sleep times was 1.6223 hours per night. Given this information, test to see if there is significant evidence to suggest that the true mean amount of nightly sleep for all college students is less than 7 hours per night. Use the 0.05 level of significance to make your statistical decision.

Using plain language, interpret your statistical decision.