Any help to offer on here? I cannot figure this out or the calculated test statistic. This is on my homework and we have a test next week before the final

Employees in a large company are entitled to 15-minute coffee breaks. A random sample of the duration of coffee breaks for 10 employees was taken with the times shown below. Assuming that the times are normally distributed, Is there enough evidence at the 1% significance level to indicate that on average employees are taking longer coffee breaks than they are entitled to? Data Collected X 14 N - 16 15 18 20 17 18 16 18 10 16 The rejection region = ? (four decimal places)