Alternative hypothesis as well? Struggling with this. Don't know how to do calculated test statistic either.

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 16 15 18 20 17 18 16 18 10 16 The null hypothesis is