Describes why the t distribution is used

Question

Explain why the t distribution is used as a part of the confidence interval. 

A lady sells homemade bread at 50 locations in town. She is concerned about absenteeism with the workers. Below is the number of days for a sample of 10 workers for the last 2 week pay period

4

1

2

2

1

2

2

1

0

3

A. describes why the t distribution is used as a part of the confidence interval.
B. Is it reasonable to end that the typical worker does not miss any days during a pay period?