1. Student's t distribution is used to establish a confidence level, using confidence intervals and degrees of freedom.

why is this statement false

2. The degrees of freedom in the Student's t-distribution determine ...

a. the confidence interval of the distribution

b. the maximum values of the distribution

c. the shape of the distribution

d. the size of the distribution

3. Given a fixed number of degrees of freedom, the table corresponding to the Student's t distribution records a value t_a that is interpreted as ...

a. the tail area 'a' to the right of t_a

b. the area 'a' of tails half to the right half to the left of t_a

c. the area 'a' of tails both to the right and to the left of t_a

d. the tail area 'a' to the left of t_a